I am trying to create a shortcut for a word document (.docx) on Lubuntu desktop (22.04 LTS). I thought I could create a symlink as follows:
ln -s a.docx ~/Desktop/
The symlink does get created and show up as a shortcut on the desktop. But it seems that Lubuntu does not treat it as a shortcut. When I double-click a.docx on Desktop, Lubuntu asks me to choose a program to open the symlink as shown in the screenshot below.
What is the right way to create a shortcut on Lubuntu desktop?
I am trying to build MikTeX on a fresh Ubuntu 22.04 but got an error about curl: (60) SSL certificate problem. The build process has worked before.
I build from source following the official instructions. I basically cloned the source at https://github.com/MiKTeX/miktex.git, then built with:
mkdir -p build/ && (cd build/ && cmake -DCMAKE_INSTALL_PREFIX:PATH=/opt/miktex .. && sudo cmake --build . --target install)
The error message is below. I've tried updating with apt, to no avail. I am not sure where to trace to problem, and the which certificate expired. I looked into the install instructions linked above. But there is no mention of curl.
Does anyone know how to fix the issue?
INFOfribidi libs: /usr/lib/x86_64-linux-gnu/libfribidi.so
INFOfribidi incs: /usr/include/fribidi;/usr/include
-- Found the following ICU libraries:
-- i18n (required)
-- uc (required)
-- Configuring done
-- Generating done
-- Build files have been written to: /home/xxx/src/miktex/build
[sudo] password for xxx:
[ 0%] Generating miktex-fontconfig.tar.lzma
[ 0%] Generating miktex-misc.tar.lzma
[ 0%] Generating tetex.tar.lzma
curl: (60) SSL certificate problem: certificate has expired
More details here: https://curl.se/docs/sslcerts.html
curl failed to verify the legitimacy of the server and therefore could not
establish a secure connection to it. To learn more about this situation and
how to fix it, please visit the web page mentioned above.
gmake[2]: *** [CMakeFiles/gen-bootstrapping-files.dir/build.make:103: tetex.tar.lzma] Error 60
gmake[1]: *** [CMakeFiles/Makefile2:3579: CMakeFiles/gen-bootstrapping-files.dir/all] Error 2
gmake: *** [Makefile:166: all] Error 2
Is there a way to disable Lunbuntu 20.04 LTS's screen saver from the command line?
I know that it can be disabled via the system menu Preferences -> Screen Saver and the associated dialog box. I need to do this remotely via SSH on multiple machines, as they are consuming a lot of CPU power.
Related:
I often find it convenient to edit a document in one file format while storing it in another format. For example, a document can be written down in markdown, converted to a word file and edited there. And I am hoping to extract the edits and applied them back to original markdown file.
So, I would have A.md, converted to A.docx (e.g. using pandoc), edited to B.docx, and somehow apply the change set between A.docx and B.docx to A.md.
My question is:
Is there a reliable/automatic way to transfer the edits in word (text edits) back to the text-based files?
Of course, I can just convert B.docx back to a markdown B.md and overwrite A.md with B.md. But the conversion process often introduces irreversible changes so that the loop A.md => A.docx => A2.md will produce a different A2.md than the original markdown file A.md. Some effects will be added/lost (due to different newlines, fonts, formatting etc.). And I'd like to avoid such loss, and keep the final document as close to the original file A.md as possible.
Would it be possible to use diff/patch to do the following conversions in bash scripts:
A.md => A.docx => A2.md
A.docx => (edits) B.docx
B.docx => B.md
diff B.md A2.md somehow to get a portable patch
apply the patch file on A.md (instead of A2.md)
I have limited experience in using git diff, but not much with directly using diff/patch. And I was wondering if someone can help explain the command sequence needed for such "transfer" of differences.
How would one create a Ubuntu distro for a different architecture such as MIPS?
I understand that it is possible to create a customized distro for the x86/x64, and the Linux 5.7 Kernel has support for MIPS. I am just wondering how a Ubuntu-based distro can be created for a different architecture such as Ubuntu ARM or MIPS.
-- Edit --
The main question I have is about the additional steps that's needed to build a distro for a non-x86 architecture. I haven't used Linux in any other ARCH than x86/x64, so I am very new here.
According to wikipedia, Debian has official ports for MIPS. So
What are the steps to get from Debian to Ubuntu?
(e.g. Do I need an actual MIPS machine, or can this be done on a virtual machine? If I am able to run a Debian on the MIPS, then how to go from there to build Ubuntu MIPS packages?)
There are related questions (e.g. How to customize the Ubuntu Live CD?). But they start from a working Ubuntu installation, which isn't available for a new arch such as MIPS.
How to disable the shortcut keys for "Keybindings for desktop switching" for Lubuntu 20.04 as described in https://manual.lubuntu.me/stable/F/keyboard_shortcuts.html?
I need to use some of the keys there in Emacs, but Lubuntu 20.04 seems to intercept those keys before they even reach Emacs.
I used to do
sudo service lightdm restart
under Lubuntu 18.04 LTS to solve blackscreen problems sometimes. Now that lightdm is gone in Lubuntu 20.04 LTS,
what is the service equivalent to lightdm above that I can use in 20.04?
Is there a way to export all clipboard history items stored in the default Qlipper app in Lubuntu (20.04 LTS)?
I find the clipboard manager convenient, but would like to export multiple/all items in the history at times. I see some discussion about this of other clipboard managers in How do I copy the whole history of the clipboard to a text file?, but I am interested specifically in the Qlipper app as it comes with Lubuntu.
I couldn't find any options just by clicking the Qlipper icon in the launch bar (which just shows only the history list). There is no "Save As" menu.
There is a similar question about how on Ubuntu unity: to disable the grouping of windows on the launcher. If I recall, this can be done in Lubuntu 18.04.
My question is, how to disable window grouping in the Lubuntu 20.04 LTS?
User management under in Lubuntu 18.04 used to be in System Tools -> Users and User groups.
Where is this option in the new Lubuntu 20.04 LTS released today?
My Lubuntu 18.04 (as a VirtualBox 6.0.10 virtual machine) is just upgraded to
Linux pbox 5.0.0-23-generic #24~18.04.1-Ubuntu SMP Mon Jul 29 16:12:28 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
with an apt upgrade. After the upgrade, the VM shows a black screen with a cursor in the upper left corner, and seems to hang.
Does anyone have similar experience with the new 5.0 Linux kernel, and know how to fix the problem?
FYI, I can go to the GUI anytime after hitting Ctrl+Alt+F1 and then Ctrl+Alt+F7 without a problem. A systemd-analyze blame didn't show anything taking an excessive amount of time (3 seconds max) during reboot. But if I don't switch manually, the black green never disappears.
-- Update --
By the way, I got the new kernel via apt-get as follows:
sudo apt-get install --install-recommends linux-generic-hwe-18.04
gcc-9 is just released.
I was wondering if there is a repository that allows me to install gcc 9 on Ubuntu 18.04 LTS (bionic)?
There seems to be repositories supporting disco:
https://packages.ubuntu.com/disco/gcc-9-base
But I liked to have it on the current LTS for a while.
This might be naive.
But is it possible in Ubuntu to have a script send out emails without requiring passwords? (via a dummy mail server, maybe)
I was hoping to use this to allow my account to periodically send info to myself (a real email account), for example, when certain task is completed. And I don't really want to risk storing the password for a real, external email account on the hard drive.
opam 2.0 has been release for a while. I was wondering if there is any repository for installing it on Ubuntu (18.04 LTS as of Oct 2018).
I searched on bing.com and couldn't find any mention. The OPAM website itself says the current supported version is 1.2.2, but listed under the "Other" category,
Distribution Latest OPAM Maintainer Notes
Ubuntu Linux (PPA) 2.0.0 Anil Madhavapeddy (@avsm) Anil's official OPAM PPA Travis and discuss post
But the linked website therein show no recent activity (with the last being 151 weeks ago). Trying sudo add-apt-repository ppa:avsm/ppa also gives an error below.
Does anyone know how to use the repository correctly?
$ sudo add-apt-repository ppa:avsm/ppa
Latest stable versions of OCaml and OPAM.
More info: https://launchpad.net/~avsm/+archive/ubuntu/ppa
Press [ENTER] to continue or Ctrl-c to cancel adding it.
...
Err:12 http://ppa.launchpad.net/avsm/ppa/ubuntu bionic Release
404 Not Found [IP: 91.189.95.83 80]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/avsm/ppa/ubuntu bionic Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
I just installed Lubuntu 18.04 LTS. There are two options for installing gcc: gcc-7 and gcc-8. Both are available from apt-get install out of the box.
Even after I installed gcc-8, the system is still going to install gcc-7 when I install other packages such as build-essential.
Since gcc-8 is newer, is there a way to make it install gcc-8 and gcc-8 only?
This is a follow up question to How to install gcc-7 or clang 4.0?.
Following the answers therein, I was able to install gcc-7.2 by:
sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update
sudo apt-get install -y gcc-7
However, after the install, the gcc/g++ command still defaults to 5.4.0
gcc --version
gcc (Ubuntu 5.4.0-6ubuntu1~16.04.5) 5.4.0 20160609
Is it possible/safe to have gcc-7 as the default and remove the old gcc-5.x files entirely?
Note that, different from the said duplicate, I'm looking to remove/replace gcc-5.x instead of setting a symlink.
I am testing the daily built image of the upcoming Ubuntu 16.04 LTS (as of Jan 2016). And I see latest version of almost anything I want to use.
The question I have is, are these latest versions guaranteed to stay (or improve to a higher version) when the LTS is released? Or is it possible for them to be downgraded.
Are there any open source solution to remove all the comments/annotations from PDF files using command line?
I searched around, and it seems that there are solutions with commercial software, e.g. , by javascripting Acrobat Pro. The non-free cpdf also has a command line option:
The -remove-annotations operation removes all annotations from the given page range.
But I couldn't find such an option for open source tools such as pdftk. Any pointers?
I am making a new Ubuntu machine as a server, which is supposed to replace an old one with older software.
My question is:
Is it possible to transfer/copy the credentials (in terms of SSH) of the old machine/server to the new machine?
My goal is such that the new machine should supplant the old one and be seen by others as the same machine when using SSH. In other words, I want to ease the upgrading of my network without having to reset SSH-based credentials if one server (and in particular its OS) is replaced.
Thanks
-- Update --
My specific goal was to transfer credentials for the server only, but I do use ssh to replace password based login sometimes, and the suggestions on the client/server connections are also very helpful.
I have recently upgraded my computer from ubuntu 12.04 to 14.04 LTS (in one step). After the upgrade, however, I got well-known warnings like
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: POSSIBLE DNS SPOOFING DETECTED! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
The ECDSA host key for xxxx has changed,
, if I try to ssh into the computer from another linux computer.
If I try to log into the the computer from MinGW/Windows, which the host/server has a stored public key of, the login was successful for a few seconds and then the ssh session froze. The network for the host/server is down for about a few hours to a day, during which time I can't even ping the server. But it went back online again after that.
My question is: Is it possible/normal that a LTS upgrade like mine change the host key at all? Or is it more likely my computer is under man-in-the-middle-attack. How do I verify which is the case?
Thanks.
-- Update --
To try to fix the problem, I restored an Ubuntu 12.04 image that I made before the upgrade to 14.04 using fsarchive and a second Ubuntu installation. I did the recover many times before and never had a problem. But this time, after the recovery, the restored Ubuntu 12.04 wouldn't boot. I was left with a grub prompt.
Then, fixing grub, I used a liveusb to re-install grub (chroot, grub-install /dev/sda etc). Again, this fixes grub every time in the past but not this time. grub-install reports some error about "FlexNet" using sector 32.
I finally fixed grub after googling, and finding two lines of command to backup and wipe out the MBR. I don't know if anyone has had similar issue before. I never installed any software called FlexNet on my windows dual boot or Linux. And it happened only after I upgrade to 14.04 LTS. Is this a sign my computer was hacked?
After I fixed grub, I was able to upgrade again to 14.04 LTS, without any issue so far.