MountainX's questions

I just installed Ubuntu 18.04 server on a VPS using the Ubuntu installer (from a mounted ISO image). I selected BTRFS as my filesystem type during the manual partitioning phase of installation.

Now that the installation has completed, I do not see @ or @home like I normally would on the non-server install. I don't care about a @home subvolume here, but I do not want the top level volume mounted at /.

lsblk:

vda    252:0    0   25G  0 disk
|-vda1 252:1    0    1M  0 part
|-vda2 252:2    0   20G  0 part /
`-vda3 252:3    0    5G  0 part [SWAP]

The produces no results:

btrfs su li /

I tried this next:

btrfs filesystem show | awk '/ path /{print $NF}'
/dev/vda2

and:

# findmnt
TARGET    SOURCE     FSTYPE     OPTIONS
/         /dev/vda2  btrfs      rw,relatime,space_cache,subvolid=5,subvol=/

How can I create BTRFS subvolumes during installation of 18.04 server?

I would like to create @ (for /) and @varlog (for /var/log) and maybe others.

I would like to use Snapper for hourly snapshots. Is there a recommended way to set up Ubuntu server with BTRFS and Snapper?

How to use a 4G phone to provide WAN/Internet service to a LAN? I intend to use this as backup when my cable modem Internet goes down. (It goes down frequently and it is down now.)

My phone has a fast 4G connection, I pay for tethering with my provider and I have about 30 GB of data per month available.

There are several possible different ways to solve this and many people have asked similar questions. I have not found a solution from those other questions so I am asking a new and unique question.

Here is what my network looks like normally:

CableModem <-- Router <-- 48 port GigE switch <-- LAN: many wired devices (printers and Ubuntu computers) plus several wireless clients that connect to the router.

Here is what I want it to look like when Comcast goes down:

Phone's 4G Internet <-- Router <-- 48 port GigE switch <-- LAN: many wired devices (printers and Ubuntu computers) plus several wireless clients that connect to the router.

I will start by outlining the possible approaches:

1. Connect my phone to my router via USB cable. My router has USB ports. Enable USB tethering on the phone.

2. Enable Mobile Hotspot mode on my phone. Connect router to phone (e.g. as WDS wireless bridging or whatever mode is appropriate). Router obtains Internet access through phone.

3. Connect my phone to a Kubuntu laptop via USB cable. Enable USB tethering on the phone. Share this Internet connection to my router by connecting a cable from eth0 on laptop to WAN / Internet port on the router.

I prefer choice 1, but that functionality appears to be limited to specific routers. Can anyone tell me which routers support this? Another option is to use dd-wrt. Unfortunately, my present router is a Netgear R8000 and I don't think there is a stable version of dd-wrt for it (that supports openvpn, ssh tunneling, etc). I already spent time research dd-wrt. So I'm moving on to a Kubuntu-focused solution.

I understand that choice 2 will cut my bandwidth in half, so I will use that option only if I can't get the others to work.

The reason I'm here is to focus on option 3. (However, I am open to suggestions regarding getting any of these approaches to work.)

I have laptops with both Kubuntu 12.04 and 14.04. Let's assume I keep using 12.04 for this, which is what I've been working with so far. Here is what I have done already:

I created a new network connection called tethered_usb0. I restricted it to interface usb0. I enable DHCP client mode.

I connected a usb cable between my phone and my laptop. I enabled usb tethering on my phone. I now have working Internet access through this connection on my laptop. Here are the details:

Type:  Wired Ethernet
Connection State:  Connected
IP Address:  192.168.42.3
Connection Speed:  Unknown
System Name:  usb0
MAC Address: <redacted>
Driver:  cdc_ether

(BTW, I edited the standard network connection called auto_eth0 and restricted it to interface eth0.)

I created a new network connection called shared_connection. I restricted it to interface eth0.

I connected a cat5e cable between eth0 on the laptop and the WAN/Internet port on the router. I connected to this connection using KDE's network manager. It said "connected".

I went into the router GUI and set its WAN/Internet port to a static IP address of 192.168.42.4 and a gateway of 255.255.255.0.

Unfortunately, my router is not getting Internet access. I rebooted the router several times and I tried variations on my settings. No luck.

What next?

I'm looking for something like ReText, but for AsciiDoc.

The closest I have found is this relatively complex solution (or here) involving Ruby, guard, guard-shell, rb-inotify, asciidoctor, Epiphany (or another browser with LiveReload).

I'll do all that if it is the best option. But I was looking for just a simple solution, along the lines of a ReText for AsciiDoc.

I also heard that O'Reilly has some tools (e.g., the Atlas wiki interface), but I'm not submitting my documents to O'Reilly. (Atlas looks cool and I'd consider using it if I could do so privately.)

Anyone have another suggestion?

I installed an application from the developer's website and it was crashing.

I tried using this form of apport-retrace to get a report I could email to the dev myself:

apport-retrace --confirm --gdb --sandbox system --verbose --cache /my/path/cache/apport-retrace --output /mypath/apport-retrace/appname.1000.crash /var/crash/_usr_bin_appname.1000.crash

The error is:

ERROR: report file does not contain one of the required fields: CoreDump DistroRelease Package ExecutablePath

I checked the crash file and the missing field is "Package." However, the application does not come from a Debian package. Is there a way I can tell apport-retrace to ignore this field and generate the best report it can?

EDIT: I am not trying to report the bug to Ubuntu. I'm also not seeking to submit a bug report to any bug tracker. My goal is to read the crash report myself. That's really my only goal. Once I read the crash report in this particular case I'll email the dev. But in general, I want a tool that will let me read the crash reports generated by the standard tools installed on Ubuntu.

Thanks.

I have googled around and found all the usual solutions. None of them work for me. First of all, I want to make high quality recordings. Second, I use JACK audio (PulseAudio is completely uninstalled.)

My OS and hardware details are at the end. But I think JACK audio is the main challenge when it comes to screencasting. JACK is my only option because this computer's purpose is audio production.

My next challenge seems to be Ubuntu itself... ffmpeg and Ubuntu aren't so friendly. I don't really feel like compiling my own ffmpeg, for example. And even if I do (which is an option of last resort), I want to be able to record specific program windows easily, even if they move around on the screen. Command line ffmpeg seems to be limited to recording predefined screen regions and it lacks flexibility, easy of use, and simplicity.

I seek a GUI approach to recording my desktop with audio using JACK. And I want high quality audio and video that are sync'd. I think a significant number of Linux users are interested in a solution like this.

The developer of SimpleScreenRecorder (SSR) said he intends to add JACK support, so SSR is at the top of my list of potential solutions.

Main page - SimpleScreenRecorder - Maarten Baert's website

(Unfortunately, the repo version of SSR crashes and I can't try the current/latest git version because I can't get the git version to build on Ubuntu, but I'll open a separate question for that.)

Until SSR comes along with JACK audio support (if it does), I hope someone else has a solution that works now.

BTW, I do have the jack2alsa bridge. (It's part of KX Studio.)

I am running Kubuntu 12.04. Additionally, I have installed the raring-lts hardware enablement stack, KX studio, and kernel 3.8.0-30-lowlatency. I use an AMD/ATI Radeon HD6750 1 GB PCI-Express video card with 3 monitors and a Focusrite Scarlett 2i2 audio interface.

Here are some of the links I investigated in my screencasting research:

• 5 ways to record desktop in Linux
• Screen video capture for Linux - Linux Mint Community
• KDE4 built-in screencast for desktop recording | flapjacktastic
• Record desktop in Linux using ffmpeg | xpressrazor
• Record desktop in Linux using ffmpeg | xpressrazor
• Capture video of a linux desktop | commandlinefu.com
• How to Record Your Desktop Using FFmpeg on Ubuntu Linux: 10 Steps
• Main page - SimpleScreenRecorder - Maarten Baert's website
• 6 of the Best Free Linux Screencasting Software - Linux Links - The Linux Portal Site
• 6 of the Best Free Linux Screencasting Software - Linux Links - The Linux Portal Site
• [ubuntu_studio] ffmpeg using Jack as an input
• Record your desktop in Linux using ffmpeg : linux
• Crazed Mule Productions: recording desktop with ffmpeg

A small independent application is crashing on my system (Kubuntu 12.04). I want to manually review the info in the crash report and then email the relevant parts to the developer. The file is located in /var/crash/_usr_bin_appname.1000.crash however I am not sure which tool I need in order to read, edit and save the crash report in a form that I can email to the developer.

I'm on Ubuntu 12.04 (Precise) with kernel 3.8 now. Virtualbox fails with this error:

Kernel driver not installed (rc=-1908)
The VirtualBox Linux kernel driver (vboxdrv) is either not loaded or there is a permission problem with /dev/vboxdrv. Please reinstall the kernel module by executing

'/etc/init.d/vboxdrv setup'

as root. Users of Ubuntu, Fedora or Mandriva should install the DKMS package first. This package keeps track of Linux kernel changes and recompiles the vboxdrv kernel module if necessary.

One proposed solution I saw was:

sudo apt-get remove virtualbox-dkms
sudo apt-get install virtualbox-dkms

That fails with this message:

sudo apt-get install virtualbox-dkms
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following NEW packages will be installed:
  virtualbox-dkms
0 upgraded, 1 newly installed, 0 to remove and 34 not upgraded.
Need to get 676 kB of archives.
After this operation, 3,899 kB of additional disk space will be used.
Get:1 http://us.archive.ubuntu.com/ubuntu/ precise-updates/universe virtualbox-dkms all 4.1.12-dfsg-2ubuntu0.3 [676 kB]
Fetched 676 kB in 2s (258 kB/s)          
Selecting previously unselected package virtualbox-dkms.
(Reading database ... 458635 files and directories currently installed.)
Unpacking virtualbox-dkms (from .../virtualbox-dkms_4.1.12-dfsg-2ubuntu0.3_all.deb) ...
Setting up virtualbox-dkms (4.1.12-dfsg-2ubuntu0.3) ...
Loading new virtualbox-4.1.12 DKMS files...
First Installation: checking all kernels...
Building only for 3.8.0-29-generic
Building initial module for 3.8.0-29-generic
Error! Bad return status for module build on kernel: 3.8.0-29-generic (x86_64)
Consult /var/lib/dkms/virtualbox/4.1.12/build/make.log for more information.
 * Stopping VirtualBox kernel modules                                                 [ OK ] 
 * Starting VirtualBox kernel modules                                                         * No suitable module for running kernel found
                                                                                      [fail]
invoke-rc.d: initscript virtualbox, action "restart" failed.

I don't want to burn a CD, DVD or USB memory stick. And I don't care about saving the existing operating system (Linux Mint). I want to install Ubuntu (actually Kubuntu 12.04 LTS) to the computer directly from the ISO image. The image is for the Kubuntu Live DVD (3.5 GB).

The computer is now booted into Linux Mint. A set of command line steps would be satisfactory. In my mind, I simply need to trick the existing system into thinking I inserted a CD/DVD, right?

I know there is a similar question already but it does not have a good answer. The answer basically says, "see this link." I reviewed the link and I decided that StackExchange needs a good answer to this question. Furthermore, most answers at other places on the Internet assume the user is coming to Ubuntu from Windows. So I think this question is one that needs a good answer here. Thanks

I have a new external USB drive I plan to use for storing backups only. (It is a WD Red 2TB NAS Hard Drive SATA III model WD20EFRX mounted in a USB enclosure.)

The drive came without a partition table. I partitioned it with gdisk (GPT).

Should I use the btrfs file system? I'm using btrfs on my internal HDD and it has been trouble-free since I first installed Kubuntu 12.04 last year.

But I'm wondering if it would be smarter to partition this backup storage drive with ext4.

FYI, it seems like the arguments that btrfs is not production ready are old. Here's some info I found.

Matthias Eckermann, senior product manager at SUSE Enterprise Linux, says that Btrfs is ready for production systems, and as of SUSE Linux Enterprise 11 SP2 Btrfs is officially supported.

Also, according to the btrfs wiki, "since February 2012 there are two vendors who support btrfs in their distributions, Oracle and SUSE."

Here's the script code I'm using now:

getent group $MYGROUP
if [ $? -ne 0 ] ; then
    sudo su -c "groupadd $MYGROUP"
fi
sudo su -c "useradd mynewuser -p mypassword -m -g $PRIMARYGRP -G $MYGROUP"

This approach works well on openSuse. But there are several problems with the user account it creates on Ubuntu so I am seeking help here.

• the terminal prompt isn't set (echo $PS1 returns nothing)
• the arrow keys and tab key do not work correctly in the terminal
• the password doesn't seem to work (although I'm still unclear exactly what this issue is)
• the /etc/sudoers rights set for this new user are not honored

If instead I manually create the user with adduser (instead of useradd) I don't have these problems on Ubuntu. But I can't use adduser on openSuse (afaik). Therefore, I need a non-Debian-exclusive script or method of adding user accounts via my bash script that works on Ubuntu (and doesn't stop working on other distros).

Finally, I would like to understand the differences between adduser and useradd. For example, I want to know which skeleton directory is used by adduser as that might be the reason useradd isn't working as expected (because I just accepted the default).

Thanks

I have made a bash script that uses kdialog exclusively for interacting with the user. It is launched from a ".desktop" file so the user never sees the terminal. It looks 100% like a GUI app (even though it is just a bash script). It runs in KDE only (Kubuntu 12.04).

My only problem is handling password input securely and conveniently. I can't find a satisfactory solution.

The script was designed to be run as a normal user and to prompt for the password when a sudo command is first needed. In this way, most commands, those not requiring sudo rights, are run as the normal user. What happens (when the script is run from the terminal) is that the user is prompted for their password once and the default sudo timeout allows the script to finish, including any additional sudo commands, without prompting the user again. This is how I want it to work when run behind the GUI too.

The main problem is that using kdesudo to launch my script, which is the standard GUI way, means that the entire script is executed by the root user. So file ownerships get assigned to the root user, I can't rely upon ~/ in paths, and many other things are less than ideal. Running the entire script as the root user is just a very unsatisfactory solution and I think it is a bad practice.

I appreciate any ideas for letting a user enter the sudo password just once via GUI while not running the whole script as root. Thanks.

I am not finding an option to enter the keyfile when adding a network folder in Dolphin.

The "Add Network Folder" type is SSH. Dolphin allows me to enter a username, a server IP address, a port, the protocol (which is SFTP), and a folder. But Dolphin does not allow me to specify the SSH key. BTW, the SSH key requires a passphrase.

Can I make Dolphin work with an SSH key that requires a passphrase?

Right now my Helo Address = localhost (helo=localhost). Is it better to set this to my server's domain name? If so, how do I change it? I'm running Ubuntu 12.04 and Postfix. Thanks.

I'm running Ubuntu 12.04 with Postfix and Mailman. I want to set up DKIM. DomainKeys Identified Mail, or DKIM, is the successor to Yahoo's "DomainKeys". It incorporates Cisco's Identified Mail.

What are the steps for setting this up?

Is opendkim recommended?

The only reference I have is HowToForge, but I prefer to get help here (even if it is just a confirmation of the steps at that link). Actually, I think the info at HowToForge is outdated because it mentions dkim-filter instead of opendkim.

My /home partition consists of an entire physical disk. It is formatted as btrfs. I want to snapshot it. I'm confused regarding subvolume naming, in particular.

I am aware that there are similar questions, but each similar question seems to be asking something different from what I'm asking (and they are older, which means probably outdated, given the rapid development of btrfs). For example, the answer to this question is apparently not the answer to my question because my /home partition is a separate volume and the man page for btrfs shows a different command for creating snapshots now.

another similar problem, no solid solution.
someone else as confused as me on the naming issues

My question:

Starting simple: is this the correct command to take a simple snapshot of my home partition?

btrfs subvolume snapshot /home/@home /home/@home_snapshot_20120421

I got really brave and tested it and it does not work. The error is error accessing /home/@home. As shown below, @home is listed.

I'm obviously confused on subvolume names. Do I need to use them in creating snapshots? Some examples show taking snapshots of home using /home as the source parameter, but based on examples of root volumes, it seems to me that I need to use /home/@home.

Would this command work? And if not, why?

btrfs subvolume snapshot /home /home/@home_snapshot_20120421

Is the @ just a naming convention? Is it meaningful at all?

Here's some output that may be relevant:

btrfs subvolume list /home
ID 256 top level 5 path @home

I'm not sure what that means, exactly. When I try btrfs device scan it gives an error (e.g. unable to scan the device /dev/sda1). My file system doesn't have any errors. Everything is fine.

Here are my partitions. In response to one reply, no /home is not my only btrfs partition.

/dev/sda1: (boot partition) TYPE="ext2"  
/dev/sda2: (root partition) TYPE="btrfs"  
/dev/sdb1: (home partition) TYPE="btrfs"  
/dev/sdc1: (shared partition) TYPE="btrfs"  
/dev/sdc2: TYPE="swap"  

Update: There is a new and very general solution available now. It works with Firefox and other GTK apps running in KDE. See the DK Bose's answer.

Original question:

I want to use KDE file dialogs (file open, file save) in Firefox in Kubuntu 12.04.

This requires something like the ancient KGtk script, but for KDE 4.x and recent Firefox versions.

OpenSuse offers this kind of functionality. Kubuntu dropped it, but surely someone has worked on bringing this back to Kubuntu (I hope).

Note, I'm not asking about theming/looks. I'm asking about actually using KDE file dialogs instead of XUL or GTK dialog.

And the preference ui.allow_platform_file_picker doesn't affect this. I have already tried setting it to true and false. Neither options results in using KDE dialogs.

I'm out of space on /var

  25G   25G     0 100% /var

It looks like mlocate.db is the problem:

# find /var -printf '%s %p\n' | sort -nr | head
13140140032 ./lib/mlocate/mlocate.db.cgLMAM
12409839616 ./lib/mlocate/mlocate.db.MqGeqe

# cat /etc/updatedb.conf
PRUNE_BIND_MOUNTS="yes"
PRUNENAMES=".git .bzr .hg .svn"
PRUNEPATHS="/tmp /var/spool /media"
PRUNEFS="NFS nfs nfs4 rpc_pipefs afs binfmt_misc proc smbfs autofs iso9660 ncpfs coda devpts ftpfs devfs mfs shfs sysfs cifs lustre_lite tmpfs usbfs udf"

I don't see anything else to prune. So how can I fix this? Thanks

I just installed Kubuntu 12.04 beta 1.

Both Rekong and Firefox don't know how to "Open Containing Folder" for downloaded items. They also don't know how open the item itself. (I'll give the specific error below.)

Furthermore, if I manually tell Firefox (in the dialog) to remember the file associations, that creates a new problem. Every file opens in Dolphin first, then Dolphin opens the correct application. (It could almost be a feature instead of a bug, but it gets annoying at times.)

My installation is missing the file /usr/share/applications/mimeinfo.cache. I'm also missing /usr/share/applications/defaults.list and ~/.local/share/applications/mimeapps.list. If anyone has default copies of those files for this build, I would appreciate copies. I think they may help me resolve this. (Anyone else see those files missing?)

Details:

Rekong is installed by default and the problem is present in a standard configuration.

To reproduce, download a file with Rekong. Then go to Downloads > Open directory (of the downloaded file). The result is:

Error: rekonq does not know how to handle this protocol: 

The same situation exists in Firefox. I used the included Kubuntu menu item to install Firefox. No problems with the installation, everything standard.

But when I download an item (e.g., a JPG image) with Firefox and then choose to either open it or open the containing folder, I get a dialog titled "launch application" and I have to "choose an application". Once I choose an application, telling Firefox to remember it leads to the problem above: Every file opens in Dolphin.

It seems that Firefox doesn't know the mime types. However, Dolphin does know the mime types.

More info:

In Firefox preferences > Applications, the only content types shown are irc, ircs, mailto, podcast, tar file, webca and webfeed. Normally, there would be many more.

I tried deleting mimeTypes.rdf (as mentioned in a Mozilla Knowledge Base article) in my Firefox profile and it did not resolve the issue.

I also tried copying a known good complete Firefox profile from my other computer (Linux Mint 12). Once I began using that profile, it also had the problem under Kubuntu 12.04.

Here's some more info:

$ cat ~/.local/share/applications/mimeapps.list  
cat: /home/user/.local/share/applications/mimeapps.list: No such file or directory

$ cat /usr/share/applications/defaults.list  
cat: /usr/share/applications/defaults.list: No such file or directory

Unfortunately, copying those files from a working Ubuntu installation did not resolve the issue. It had seemingly no impact.

The default applications for handling files in Dolphin works correctly.

I have been continuing to research this. I was reading this knowledge base article: http://kb.mozillazine.org/File_types_and_download_actions#Resetting_download_actions

It says, "All versions of Firefox and SeaMonkey will use an installed and enabled plugin to open a downloaded file by default, based on its MIME type."

I checked and the only plugin installed in Firefox is Skype Buttons for Kopete. Nothing else. On my Linux Mint install, there are a number of plugins, including Gnome Shell Integration. Could missing plugins be the issue?

There's a similar question here with no solution.

Here's a question where the problem sounds almost identical, but the solution is unrelated. I'm working with a new, fresh installation of Kubuntu and I don't have any other DE installed.

I have reviewed other answers such as What are good CD Ripping Programs?. I didn't find my solution yet.

The solution I seek: I want to enter or edit track titles and album info manually in the GUI before I start ripping.

I'm using RubyRipper and it has this feature, but RubyRipper is way too slow my current situation. I'm ripping some new audio books I just purchased. They are typically not found the the CDDB and some discs don't show any track titles in the ripping software. So I want to enter this info manually.

An alternative solution might be some way to organize the file names after ripping. I'm open to suggestions on that. So far, my attempts to do that have indicated it will be too time consuming and error-prone. So my question is really focused on using the GUI of the ripping software.

I'm also open to using scripts and command line tools -- but only if it is faster and more efficient. Speed and efficiency count in this task. For example, I'd want to be able to just paste all track titles into a config file, not have to do painstaking editing of a complex command for each CD.

The reason why RubyRipper is not appropriate is because the original recording quality is not that great. It sounds like the speaker's microphone is rubbing on paper or maybe his clothing at times. I think this causes RubyRipper problems. Some tracks cannot be "corrected" after the maximum trials.

But with this poor original quality, I don't care about RubyRipper's efforts at achieving perfection. And I can't seem to set the preferences to completely turn off this matching. (The lowest value is 2 and that's what I've been using.) If I'm ripping classical music, I absolutely want to use RubyRipper (or maybe ABCDE). But for my current 32 CD audio book (and similar situations) neither of those options are appropriate. It took all day to rip just 5 of the 32 CDs from the first of many audio books. At that rate, this project will take months. It should take a day, max.

EDIT/UPDATE: I'm still looking for the ideal solution. I haven't found it. In the mean time, here's what I'm doing. I'm using Asunder for quick and simple ripping. I'm not editing track names at the ripping stage. Next I'm using Easy Tag to edit the tags as well as track names (and even file names). Easy Tag basically solved my problem, but in a way I hadn't anticipated. Finally, if I need more precise changes to the file names, I'm using "rename" on the command line. This is the most efficient approach I have found so far. I'll probably finish this project using this approach.

I've been using Ubuntu for a while and Java Web Start applications have never "just worked" in the current or any prior version, so I ignored them until now. However, now I have a need to get them working in Firefox. When I am on a page like this: http://www.oracle.com/technetwork/java/demos-nojavascript-137100.html I want to be able to click on the demos as suggested and have them run.

I'm running Ubuntu 11.10 with Gnome 3 and/or Linux Mint 12 (64 bit) with OpenJDK 6, OpenJDK 7 and Sun Java 6. My default is currently: /usr/lib/jvm/java-6-openjdk/jre/bin/java

$ whereis javaws
javaws: /usr/bin/javaws

/etc/alternatives/javaws -> /usr/lib/jvm/java-6-openjdk/jre/bin/javaws

Here's the error I get when I try to run a Java Web Start application:

net.sourceforge.jnlp.LaunchException: Fatal: Initialization Error: Could not initialize application.
    at net.sourceforge.jnlp.Launcher.createApplication(Launcher.java:776)
    at net.sourceforge.jnlp.Launcher.launchApplication(Launcher.java:552)
    at net.sourceforge.jnlp.Launcher$TgThread.run(Launcher.java:887)
Caused by: net.sourceforge.jnlp.LaunchException: Fatal: Initialization Error: A fatal error occurred while trying to verify jars.
    at net.sourceforge.jnlp.runtime.JNLPClassLoader.initializeResources(JNLPClassLoader.java:448)
    at net.sourceforge.jnlp.runtime.JNLPClassLoader.<init>(JNLPClassLoader.java:176)
    at net.sourceforge.jnlp.runtime.JNLPClassLoader.getInstance(JNLPClassLoader.java:295)
    at net.sourceforge.jnlp.Launcher.createApplication(Launcher.java:767)
    ... 2 more
Caused by: 
net.sourceforge.jnlp.LaunchException: Fatal: Initialization Error: A fatal error occurred while trying to verify jars.
    at net.sourceforge.jnlp.runtime.JNLPClassLoader.initializeResources(JNLPClassLoader.java:448)
    at net.sourceforge.jnlp.runtime.JNLPClassLoader.<init>(JNLPClassLoader.java:176)
    at net.sourceforge.jnlp.runtime.JNLPClassLoader.getInstance(JNLPClassLoader.java:295)
    at net.sourceforge.jnlp.Launcher.createApplication(Launcher.java:767)
    at net.sourceforge.jnlp.Launcher.launchApplication(Launcher.java:552)
    at net.sourceforge.jnlp.Launcher$TgThread.run(Launcher.java:887)

Here's another example:

http://docs.oracle.com/javase/tutorial/uiswing/events/keylistener.html

net.sourceforge.jnlp.LaunchException: Fatal: Read Error: Could not read or parse the JNLP file.
    at net.sourceforge.jnlp.Launcher.fromUrl(Launcher.java:491)
    at net.sourceforge.jnlp.Launcher.launch(Launcher.java:283)
    at net.sourceforge.jnlp.runtime.Boot.run(Boot.java:199)
    at net.sourceforge.jnlp.runtime.Boot.run(Boot.java:51)
    at java.security.AccessController.doPrivileged(Native Method)
    at net.sourceforge.jnlp.runtime.Boot.main(Boot.java:165)
Caused by: java.io.IOException: port out of range:-2147483648
    at net.sourceforge.jnlp.JNLPFile.openURL(JNLPFile.java:255)
    at net.sourceforge.jnlp.JNLPFile.<init>(JNLPFile.java:185)
    at net.sourceforge.jnlp.JNLPFile.<init>(JNLPFile.java:162)
    at net.sourceforge.jnlp.JNLPFile.<init>(JNLPFile.java:148)
    at net.sourceforge.jnlp.Launcher.fromUrl(Launcher.java:477)
    ... 5 more
Caused by: 
java.io.IOException: port out of range:-2147483648
    at net.sourceforge.jnlp.JNLPFile.openURL(JNLPFile.java:255)
    at net.sourceforge.jnlp.JNLPFile.<init>(JNLPFile.java:185)
    at net.sourceforge.jnlp.JNLPFile.<init>(JNLPFile.java:162)
    at net.sourceforge.jnlp.JNLPFile.<init>(JNLPFile.java:148)
    at net.sourceforge.jnlp.Launcher.fromUrl(Launcher.java:477)
    at net.sourceforge.jnlp.Launcher.launch(Launcher.java:283)
    at net.sourceforge.jnlp.runtime.Boot.run(Boot.java:199)
    at net.sourceforge.jnlp.runtime.Boot.run(Boot.java:51)
    at java.security.AccessController.doPrivileged(Native Method)
    at net.sourceforge.jnlp.runtime.Boot.main(Boot.java:165)