Lucio's questions

In VirtualBox you can create VM and it will store it on a folder inside the Default Machine Folder of VirtualBox.

For instance, after create an ubuntu-headless VM it will create an ubuntu-headless directory with a couple of files and more folders inside.

I want to get this VM working on another system with also VirtualBox, like a duplicate.

Will a simple copy/paste of this VM directory inside Default Machine Folder of the target system work?

TL;DR: How to transfer a VirtualBox image from one system to another?

I installed Tomcat 7 following the Ubuntu guide. The server is working and gives me the "It works!" page on http://localhost:8080/.

Now I want to setup my own webapp using Netbeans. I generated a new Web Project with Java EE 6 and Tomcat 7. The user is on the /var/lib/tomcat7/conf/tomcat-users.xml file properly configured.

When I run the project everything seems ok, but when I open the browser it displays a 500 error.

• The Tomcat output mentions permission errors trying to access tomcat7/logs and
• The IDE logs trying to access tomcat7/conf.

Files permissions:

lucio@lucio-pc:/$ ll /var/lib/tomcat7/logs
lrwxrwxrwx 1 root root 17 jul 24 18:07 /var/lib/tomcat7/logs -> ../../log/tomcat7/
lucio@lucio-pc:/$ ll /var/log/tomcat7/
total 136
drwxr-x---  2 tomcat7 adm      4096 ago 28 10:50 ./
drwxrwxr-x 15 root    syslog   4096 ago 28 09:29 ../
-rw-r--r--  1 tomcat7 tomcat7   800 ago 26 17:23 catalina.2014-08-26.log.gz
-rw-r--r--  1 tomcat7 tomcat7  5173 ago 27 21:59 catalina.2014-08-27.log
-rw-r--r--  1 tomcat7 tomcat7 31285 ago 28 10:36 catalina.2014-08-28.log
-rw-r--r--  1 tomcat7 root    44192 ago 28 10:36 catalina.out
-rw-r--r--  1 tomcat7 tomcat7    45 ago 26 16:19 localhost.2014-08-26.log.gz
-rw-r--r--  1 tomcat7 tomcat7     0 ago 27 11:15 localhost.2014-08-27.log
-rw-r--r--  1 tomcat7 tomcat7   433 ago 28 09:49 localhost.2014-08-28.log
-rw-r--r--  1 tomcat7 tomcat7  7435 ago 26 17:23 localhost_access_log.2014-08-26.txt
-rw-r--r--  1 tomcat7 tomcat7     0 ago 27 11:15 localhost_access_log.2014-08-27.txt
-rw-r--r--  1 tomcat7 tomcat7 15186 ago 28 09:58 localhost_access_log.2014-08-28.txt

I don't understand why can't access the files, you can see that the user and group tomcat7 has permissions to the files. Is there a user for the JVM that needs privileges over the files?

I also tried changing files ownerships as mentioned here but it doesn't change at all.

The /etc/default/tomcat7 file has:

TOMCAT7_USER=tomcat7
TOMCAT7_GROUP=tomcat7

So I guess it is running as tomcat7 user.

I added my user into the tomcat7 group:

sudo usermod -aG tomcat7 $USER

And then restarted the machine, but the problem persist.

I setup a Trusty VM with Django + Nginx (other stuffs too).

The server is working, I get the "Welcome to Django" page. But when I enter to servername/admin it loads the HTML page but fails to load the static content.

And the admin page have this links to static content:

<link rel="stylesheet" type="text/css" href="/static/admin/css/base.css" />
<link rel="stylesheet" type="text/css" href="/static/admin/css/login.css" />

Both of the CSS files give me 404, as the Nginx log shows:

192.168.56.1 - - [05/Jun/2014:12:04:09 -0300] "GET /admin HTTP/1.1" 301 5 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:29.0) Gecko/20100101 Firefox/29.0"
192.168.56.1 - - [05/Jun/2014:12:04:09 -0300] "GET /admin/ HTTP/1.1" 200 833 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:29.0) Gecko/20100101 Firefox/29.0"
192.168.56.1 - - [05/Jun/2014:12:04:10 -0300] "GET /static/admin/css/base.css HTTP/1.1" 404 142 "http://ubuntu-server/admin/" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:29.0) Gecko/20100101 Firefox/29.0"
192.168.56.1 - - [05/Jun/2014:12:04:10 -0300] "GET /static/admin/css/login.css HTTP/1.1" 404 142 "http://ubuntu-server/admin/" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:29.0) Gecko/20100101 Firefox/29.0"

I think that the error is on my nginx.conf file, but no idea how to solve it. This is the site tree:

Major files: urls.py, settings.py.

I can't compile a default new project for Android 2.1 because(?) the JDK used by Android Studio is JDK 1.7 but it should be JDK 1.6.

To change it I go to File -> Project Structure and try to find the JDK 1.6 location.

But when I select its directory and press OK I get the following error:

Please choose a valid JDK directory

As you can see on the screenshoot I'm trying to set Java 6 OpenJDK 64-bits as the new JDK.

What can I do? Isn't Android Studio compatible with OpenJDK and should I use Oracle JDK instead?

After add the Manage Networks icon into the panel, I can see my Wi-Fi network on the list. So I click on the SSID and it prompt for a password. I enter the right or wrong password but nothing happens.

The access point is working fine, I have others devices connected to it working properly.

I've tried to compile the RTL8191SE driver but they have syntax errors.

More information:

lsmod

dmesg | tail -n 30

$ uname -a
Linux lucio-net 3.13.0-24-generic #46-Ubuntu SMP Thu Apr 10 19:11:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

$ lspci -nn | grep 0280
Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8191SEvB Wireless LAN Controller [10ec:8172] (rev 10)

$ nmcli d
DEVICE TYPE             STATE
wlan0  802-11-wireless  disconnected

$ nm-tool
NetworkManager Tool

State: disconnected

- Device: wlan0
Type: 802.11 WiFi
Driver: rtl8192se
State: disconnected
Default: no

Capabilities:

Wireless Properties
 WEP Encryption: yes
 WAP Encryption: yes
 WAP2 Encryption: yes

Wireless Access Points
 [SSID]: Infra, [MAC], Freq 2462 MHz, Rate 54 Mb/s, Strength 100 WPA WPA2

As of today, a bug in OpenSSL has been found affecting versions 1.0.1 through 1.0.1f (inclusive) and 1.0.2-beta.

Since Ubuntu 12.04, we are all vulnerable to this bug. In order to patch this vulnerability, affected users should update to OpenSSL 1.0.1g.

How can every affected user apply this update now?

I had the Ubuntu repositories of SQLite3 with v3.7.17. But it doesn't have the .save command as newer versions.

To update I did:

1. sudo apt-get purge sqlite3
2. Download SQLite 3.8.4.3
3. Install it with ./configure && make && sudo make install

But now when I try to run sqlite3 from command line I get:

SQLite header and source version mismatch
2013-05-20 00:56:22 118a3b35693b134d56ebd780123b7fd6f1497668
2014-04-03 16:53:12 a611fa96c4a848614efe899130359c9f6fb889c3

Searching I found two solutions that I've tried without success:

• This answer didn't work because I don't have sqlite on /usr/bin
• This solution didn't work neither, but I did backup to revert those useless changes.

Any idea of how to solve this error?

I'm developing a Java application using jFrames, and the application menu bar object doesn't integrate with Unity's Panel (Window Title & Application Menus) as any native Unity application does.

Is there a way to do it?

My app:

Firefox integration: (what I want to)

I re-installed mono-runtime due to this error and it is solved.
But now I want to uninstall it (but in Ubuntu 13.10). So this is what happens:

hogar@hogar-desktop:~$ sudo apt-get purge mono-runtime
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 libgtk2.0-cil : Depends: libmono-cairo4.0-cil (>= 2.10.1) but it is not going to be installed
                 Depends: libmono-system-drawing4.0-cil (>= 1.0) but it is not going to be installed
 libmono-corlib4.0-cil : Depends: mono-runtime (>= 2.10.8.1) but it is not going to be installed
                         Depends: mono-runtime (< 2.10.8.2) but it is not going to be installed
                         Recommends: libmono-i18n-west4.0-cil but it is not going to be installed
 libmono-system-web-services4.0-cil : Depends: libmono-system-configuration4.0-cil (>= 1.0) but it is not going to be installed
                                      Depends: libmono-system-enterpriseservices4.0-cil (>= 1.0) but it is not going to be installed
                                      Depends: libmono-system-web4.0-cil (>= 2.10.3) but it is not going to be installed
 libmono-system4.0-cil : Depends: libmono-security4.0-cil (>= 2.10.1) but it is not going to be installed
                         Depends: libmono-system-configuration4.0-cil (>= 1.0) but it is not going to be installed
                         Depends: mono-runtime (>= 2.10.8.1) but it is not going to be installed
                         Depends: mono-runtime (< 2.10.8.2) but it is not going to be installed
 monodoc-manual : Depends: monodoc-browser but it is not going to be installed or
                           monodoc-http but it is not going to be installed or
                           monodoc-viewer
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.

I looked at this very popular post but in this case I'm not installing a package. So not very sure

Any idea?

Additional info:

• My /var/log/dist-upgrade/apt.log file is empty.
• The command dpkg --get-selections | grep hold returns nothing

Problem

Many users (including me) found out from one moment to another that the usage disk space is really strange. One day I had 50Gb free and the next I had 3Gb, it is just crazy.

This happened with different versions of Ubuntu (11.04, 12.04 and 12.10 just to mention).

Some of those user have create question on this site, some of them:

• Disk Usage Very Strange
• Ubuntu 12.10 recognizes me only 3GB of free space
• Why am I getting low disk space usage?

Solution

@NathanWienand have discovered that the problem was caused by the .xsession-errors.old file (it can be found on the $HOME directory) and he and others user solved the problem removing the file. An example of the size that can have this file is ~100Gb, not reasonable..

Question

• Why does this happen?
• Is deleting the file the only way to solve it?
• Isn't there another way to solve this with a large period effect?
• Does this problem affect only to 64 bits system's users?

If you have something to add here, feel free to edit the question.

I want to see if a string is inside a portion of another string.
e.g.:

'ab' in 'abc' -> true
'ab' in 'bcd' -> false

How can I do this in a conditional of a bash script?

When I try to do ./configure over AWN v0.4 I get this error:

configure: error: in `/home/desktop/Software/avant-window-navigator-0.4.0':
configure: error: 
  Could not link test program to Python. Maybe the main Python library has been
  installed in some non-standard library path. If so, pass it to configure,
  via the LDFLAGS environment variable.
  Example: ./configure LDFLAGS="-L/usr/non-standard-path/python/lib"
  ============================================================================
   ERROR!
   You probably have to install the development version of the Python package
   for your distribution.  The exact name of this package varies among them.

So maybe I can solve this adding the path of the python library to the command. But I don't know where is it.

See the full output here

If I want to uninstall the Amazon WebApp that comes by default in the newest versions of Ubuntu, it ask me to remove other software as well. As you can see in the next picture, it is forcing me to uninstall unity-webapps-livemail and unity-webapps-youtube.

Is this a bug in Ubuntu or is this intentioned? This behavior will disappear in future releases of Ubuntu?

I installed Ubuntu 12.10, and I don't know why, I have an ext2 partition.

• How can I convert this ext2 file system to an ext4?
• Will I lose all my data?

I've installed the latest catalyst driver (beta) following the step in this guide for Ubuntu Quantal Quetzal.
My system is 64 bit and my graphic card is an ATI RadeonHD 6670, this g.c. is Officially Supported (Catalyst & Open Source), you can confirm that from this AMD Linux Community thread.

I don't have any problem, except the AMD testing use only watermark. I see the following frame in any stage into the OS (logged, unlloged, etc.) except in the terminals.

I found different versions of how to remove this image, but this change according to the system, so I want an answer from this popular (trusted) site.

• How to solve this issue in Ubuntu 12.10 32b?
• This procedure is different in a 64b system?

I did a backup of several music files from my older Windows XP system. Now I can play all the .MP3 files but not all the .WMA. There are some kinds of WMA files that can be reproduced without problems, may refute this in the picture below. The right file can be played, the left isn't.

I have long been looking different sites, Q&A from here, installing many packages but not luck. An example is this answer.

What can I do?

My system: Ubuntu 11.10 32b. Player: Banshee & VLC

My system is Ubuntu 11.10 (installed from 0, without upgrades/updates). When I enter into any tty (1, 2, 3..) it ask me my login name and password but I can not move forward.

When I enter an user without password or the root (I have enabled the account) the prompt show me this:

Module is unknown

What is this? Why it is happening? There isn't any way to fix?

NOTE: My boot stop when Cheking battery state [OK] so I cannot go to the GUI. I did never use any TTY but now I am forced to do so.

The auth.log file:

Top 10 lines:

Sep  9 20:09:01 M68MT-S2P CRON[2749]: pam_unix(cron:session): session opened for user root by (uid=0)
Sep  9 20:09:01 M68MT-S2P CRON[2749]: pam_unix(cron:session): session closed for user root
Sep  9 20:17:01 M68MT-S2P CRON[2821]: pam_unix(cron:session): session opened for user root by (uid=0)
Sep  9 20:17:01 M68MT-S2P CRON[2821]: pam_unix(cron:session): session closed for user root
Sep  9 20:39:01 M68MT-S2P CRON[2961]: pam_unix(cron:session): session opened for user root by (uid=0)
Sep  9 20:39:01 M68MT-S2P CRON[2961]: pam_unix(cron:session): session closed for user root
Sep  9 20:50:36 M68MT-S2P sudo:    lucio : TTY=pts/0 ; PWD=/home/lucio ; USER=root ; COMMAND=/usr/bin/apt-get update
Sep  9 20:52:42 M68MT-S2P polkitd(authority=local): Operator of unix-session:/org/freedesktop/ConsoleKit/Session2 successfully authenticated as unix-user:lucio to gain TEMPORARY authorization for action org.debian.apt.install-or-remove-packages for system-bus-name::1.71 [/usr/bin/python /usr/bin/update-manager --no-focus-on-map] (owned by unix-user:lucio)

Last 3 lines (last attempt to access through TTY):

Oct  1 00:27:53 M68MT-S2P login[1429]: PAM unable to dlopen(/lib/security/pam_access.so): /lib/security/pam_access.so: cannot open shared object file: No such file or directory
Oct  1 00:27:53 M68MT-S2P login[1429]: PAM adding faulty module: /lib/security/pam_access.so
Oct  1 00:27:53 M68MT-S2P login[1429]: Module is unknown

The complete auth.log file here.

I'm trying to install Komparator4 v0.8 from the terminal of Ubuntu 11.10. I entered this command and work fine:

mkdir build && cd build && cmake -DCMAKE_INSTALL_PREFIX=`kde4-config --prefix` ..

But when I enter make I get this output whit error messages.

I installed this program with this method twice previously and I had no problems.

What I'm doing wrong?

I've seen videos like this one in which a effect appears when the user made a click. What I want it's just the effect only, I don't care the colour of the cursor.

How can I make this effect when I do a click in Ubuntu 11.10?

My monitor has an Analogical connection. First I install windows 7, then I install Ubuntu 11.10, when this installation finish I restarted the PC.

Any time there I turn on the PC I see the BIOS configuration (Windows appears with the same, this is normal), then appear Loading system and 3 seconds later (with no boot-loader) I get this message on the monitor:

Signal out of range
92KHz - 58Hz

Because I don't see anything in the screen I wait around 10 seconds and then appears Ubuntu. To boot Windows I must press 5 or more times the down arrow key and Enter

This message appears in different location, as when I press Ctrl+Alt+F1 (opening a TTY) this message appears again, then I press Ctrl+Alt+F7 and appears my desktop with graphic problems.
So I think the problem is due to the graphics drivers.