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Q&A

General Q&A about Linux and Unix-like operating systems

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60%
+1 −0
xrandr rotate not filling external monitor

Problem I can rotate output, but it does not fill screen. Instead it rotates in place so that the right side of the screen goes off the monitor. xrandr --output HDMI-2 --auto --mode 1920x1080 --...

1 answer  ·  posted 1y ago by mcp‭  ·  last activity 1y ago by mcp‭

77%
+5 −0
Installing Ruby on MacOS 12.2 (or 11.6) produces compilation errors in the downloaded source; how do I fix?

A project I want to work on requires Ruby. I was directed to RVM or rbenv. I tried rbenv first because it has Mac instructions, ran into failures, uninstalled it and installed RVM, and still ran ...

1 answer  ·  posted 2y ago by Monica Cellio‭  ·  edited 2y ago by Monica Cellio‭

66%
+2 −0
How to install printer driver for Canon PIXMA TR4522 printer in Arch Linux

I have used printers before in Arch Linux, but I can't figure out how to print with a Canon PIXMA TR4522 printer. More specifically, I am having trouble finding the correct driver. I have installe...

1 answer  ·  posted 2y ago by Trevor‭  ·  edited 1y ago by Trilarion‭

25%
+0 −4
Is there possible way to change bit if my system is using 64 bit kernel?

Is it possible to change bit of a system? My system is using 64 bit kernel. I was trying to install chrome in my system. But, I couldn't since chrome doesn't support 32 bit. Since my system is usin...

1 answer  ·  posted 2y ago by Anonymous‭  ·  edited 2y ago by Anonymous‭

bit
40%
+2 −4
How to give password in shell script?

That's my Bash script: #!bin/sh cd qpixel sudo systemctl enable mysql mysql -u root -p rails s When it executes the line mysql -u root -p it will ask for password. To do so, I have tried...

1 answer  ·  posted 3y ago by deleted user  ·  edited 1y ago by fedorqui‭

50%
+0 −0
Automated wifi 'scavenging', daemon recommendation?

I have a RPi in the car that I need to act as a mobile AP. I need it to provide a consistent, unchanging ESSID (in AP mode) using the onboard wlan0 for all devices that stay in my car. Dashcams, t...

0 answers  ·  posted 2y ago by re89j‭

75%
+4 −0
How to configure GNOME Keyring to by default NOT automatically unlock keyrings whenever logged in, on Debian?

On a Debian Buster system I use, the password for connecting to a VPN is stored in the GNOME Keyring. Therefore, whenever I want to connect to the VPN in question, I get prompted to unlock my keyri...

1 answer  ·  posted 3y ago by Canina‭  ·  edited 3y ago by deleted user

71%
+3 −0
Close all desktop notifications

I'd like to hide/dismiss/remove all the notifications that applications like Signal have created. I know I can create notifications with, for example, notify-send -t 10000 "🤖 Here goes my message"...

1 answer  ·  posted 2y ago by Matthias Braun‭  ·  last activity 2y ago by Matthias Braun‭

50%
+0 −0
Intel® Centrino® Advanced-N 6205 not found in Debian

I was installing Debian. But, I know that I have installed wireless connection system manually in Debian. are e needs non-free firmware files to operate. The firmware can be h as a USB stick o...

2 answers  ·  posted 3y ago by deleted user  ·  edited 1y ago by Canina‭

50%
+1 −1
Is it possible to install .deb file on arch-based Linux?

Is it possible to install .deb extension file in Arch-Based Linux? I saw there's no dpkg package. But, if installing .deb file possible than, how?

2 answers  ·  posted 3y ago by deleted user  ·  last activity 2y ago by Grove‭

50%
+0 −0
unable to access Manjaro (kernel file not found)

I have Prime OS and Windows 10 alongside Linux Manjaro. I was using Prime OS nearly 2 hours. Then, I turned off my laptop for 30-60 minutes. Then, I turned my laptop on and I was using Windows 10 f...

1 answer  ·  posted 3y ago by deleted user  ·  last activity 3y ago by deleted user

75%
+4 −0
Desktop Multiplexer for Linux? (GNU Screen for GUI apps)

GNU Screen and Tmux allow you to run command-line programs on a server, and 'disconnect' from them but let them keep running remotely. This is great if your primary computer is a laptop and it has...

1 answer  ·  posted 2y ago by re89j‭  ·  edited 2y ago by re89j‭

71%
+3 −0
Can I make a compressed RAM drive and externally prepare a (pre-)compressed file to copy onto it?

I don't know what these things are called exactly in the Linux world. But there is the concept of a drive in RAM, to write files onto and read them like it was any disk drive. There is also the c...

1 answer  ·  posted 2y ago by CanisSomnolentus‭  ·  edited 3mo ago by matthewsnyder‭

60%
+1 −0
Reducing Noise from yum-cron when repos are out of date

I have a few CentOS servers that I want to stay automatically up to date with yum-cron, and I want to get emails when there are problems but I do not want to get so many emails about repos being ou...

0 answers  ·  posted 2y ago by re89j‭  ·  edited 2y ago by Canina‭

66%
+2 −0
Access host device which bridges a connected device through same eth interface

I got 2 small computers running Linux. One acts as ethernet gadget, connected via USB to the other, the host. I set up a bridge, like so: ip link add name br0 type bridge ip link set dev br0 up...

1 answer  ·  posted 2y ago by sktpin‭  ·  last activity 2y ago by sktpin‭

28%
+0 −3
Why I can't update my system? (Kali Linux)

I had installed Kali Linux recently. I can't update or upgrade my system. Even, I can't install anything. Here's the error log apt update Get:1 http://kali.cs.nctu.edu.tw/kali kali-rolling InRele...

1 answer  ·  posted 2y ago by Anonymous‭  ·  last activity 2y ago by Anonymous‭

60%
+1 −0
With a V4L2-compatible webcam, how to see its video feed for the purpose of adjusting aiming?

I have ordered (but am still waiting for it to arrive) a USB-connected webcam that is supposed to be V4L2 compatible. Once it arrives, I'm obviously going to want to mount it such that it provides...

1 answer  ·  posted 2y ago by Canina‭  ·  last activity 2y ago by Quasímodo‭

66%
+2 −0
"A server is already running" error in rails

..$ rails s => Booting Puma => Rails 5.2.6 application starting in development => Run `rails server -h` for more startup options A server is already running. Check /home/istiak/ruby/q...

2 answers  ·  posted 3y ago by deleted user  ·  edited 1y ago by Trilarion‭

71%
+3 −0
How to detect if a Linux Docker host has had unwelcome guests?

I plan to set up a Raspberry Pi to host some dockerized apps, for it to be accessible to the Internet through a remote proxy, and since I'm no sysadmin, I'm trying to come up with a suitable policy...

1 answer  ·  posted 2y ago by nnlei‭  ·  last activity 2y ago by Canina‭

50%
+0 −0
printer installation in Linux

I had write some texts in LibreOffice Writer. Now, I want to print them to pages. For that reason, we use "printer". My printer's name is HP laserJet P1007. In Windows, I can simply download from h...

1 answer  ·  posted 3y ago by deleted user  ·  last activity 3y ago by deleted user

50%
+0 −0
Ruby installation in Manjaro (Arch-Based Linux)

I was reading the documentation. In Debian based Linux, I have to install build-essential, libssl-dev. But, what about Arch-Based Linux? I had tried sudo pacman -Syy build-essential libssl-dev ...

2 answers  ·  posted 3y ago by deleted user  ·  last activity 2y ago by Anonymous‭

71%
+3 −0
Get current server of pacman

How do I get the URL of the remote repository that pacman uses to download packages? I know that I can tell pacman which server to use by editing /etc/pacman.d/mirrorlist. But in my case, all of t...

1 answer  ·  posted 2y ago by Matthias Braun‭  ·  edited 2y ago by Matthias Braun‭

33%
+1 −4
Substituting text in a sed like manner but with a richer format

I have the following problems working with sed: It doesn't allow multiline operations (thus, no indentations, no nesting) It is generally obligatory to wrap entire commands in quote marks (sed ...

1 answer  ·  posted 2y ago by deleted user  ·  last activity 2y ago by user53100‭

47%
+9 −10
Which Linux system to use?

Usually, many new users are confused when it comes to deciding which Linux to use. After trying out some distros, they don't know which one to use next. Which Linux is for beginners, intermediates ...

6 answers  ·  posted 2y ago by deleted user  ·  last activity 1mo ago by matthewsnyder‭

22%
+0 −5
Do shells have anything to do with port forwarding or port triggering?

I find port forwarding and port triggering as advanced sub-topics of the topic of network protocols which include the "port" concept such as TCP and UDP. I am wondering if shells in general and Ba...

1 answer  ·  posted 3y ago by deleted user  ·  last activity 3y ago by LawrenceC‭

60%
+1 −0
Trying to print with CUPS from Chromebook through Debian box to USB printer

Hi everyone, First post! I'm trying to be able to print from a client machine over my lan to an older HP Laserjet 1012 connected via USB to a Debian box. It prints fine directly. I've gone thro...

0 answers  ·  posted 2y ago by kserwick‭  ·  edited 2y ago by kserwick‭

50%
+0 −0
Grub rescue error

I was using Linux mint and Windows 10 together (in different partitions). Few months I was using it freely. Today I got a message in Windows 10 (new updates available or shutdown and update) then, ...

1 answer  ·  posted 3y ago by deleted user  ·  last activity 3y ago by deleted user

66%
+2 −0
grub loader can't detect Bliss OS | Shell

While this is about grub loader, this is likely to be a question of OS related. If it doesn't belong to this site than I will remove it. I had installed Bliss in sda2. Device Boot Start...

1 answer  ·  posted 3y ago by deleted user  ·  last activity 3y ago by deleted user

80%
+6 −0
How to forward SSH access of one machine, through another, to the rest of a network?

I have a setup with two Raspberry PIs, a CM3 module with only a USB connection to the outside, and the Pi4 with a lot of connectors. I set up things such that CM3 functions as USB Gadget, and once...

3 answers  ·  posted 3y ago by CanisSomnolentus‭  ·  last activity 2mo ago by Michael‭

22%
+0 −5
Is it possible to write more than 1 equation in LO Math? [closed]

I was using Libre Office Math. I thought I can write multiple equations in LO Math. But, I noticed I can't write more than one equation. I was trying to write multi-line. Unfortunately, I couldn't....

1 answer  ·  posted 3y ago by deleted user  ·  last activity 3y ago by deleted user

66%
+2 −0
Your Ruby version is 2.7.0, but your Gemfile specified 2.6.6.

In my Ruby project, when I try bundle install, I got: Your Ruby version is 2.7.0, but your Gemfile specified 2.6.6 I don't know how to solve it. I am using Windows Subsystem for Linux (WSL) U...

2 answers  ·  posted 3y ago by Kevin M. Mansour‭  ·  edited 3y ago by deleted user

50%
+0 −0
How can I access Manjaro without any error? (I had installed two grub-loader)

I was using Manjaro. And, I had Windows alongside Manjaro. I have installed Debian without "removing" any OS (I had removed Prime OS). And, I was using grub-loader of Manjaro earlier (Manjaro's gru...

1 answer  ·  posted 3y ago by deleted user  ·  last activity 3y ago by deleted user

37%
+1 −3
Running several commands without && or ; or ()

I copy-paste several commands at once from a markdown editor (Typora) to Bash in a Putty window terminal; the file I work with reads as follows (empty lines included): $ non sed command 1 $ non s...

1 answer  ·  posted 2y ago by deleted user  ·  last activity 2y ago by Grove‭

75%
+4 −0
Make Less use a normal view instead of hexdump view

Less does not display data files normally, but if it were some sort of Xxd. $ bash --norc $ export LESS= $ file -i /var/log/lastlog /var/log/lastlog: application/octet-stream; charset=binary $...

1 answer  ·  posted 2y ago by Quasímodo‭  ·  edited 2y ago by Quasímodo‭

71%
+3 −0
How to use a detected USB RNDIS gadget as network adapter

I have a RaspberyPi module, with USB connected to another module computer (as USB host) running Linux. The RasPi is configured as USB ethernet gadget. Once I boot the RasPi, and enter dmesg on th...

1 answer  ·  posted 2y ago by sktpin‭  ·  last activity 2y ago by sktpin‭

75%
+4 −0
What is the best way to identify changes from the default configuration in Raspbian systems?

I've got a Raspberry Pi running Raspbian, which I'd like to reinstall from scratch. However over time I've made many changes to the configuration (installed new packages, changed the name of the de...

1 answer  ·  posted 3y ago by celtschk‭  ·  last activity 3y ago by Canina‭

77%
+5 −0
Reverse shell with named pipe and netcat

This blog post describes a privilege escalation, exploiting tar's --checkpoint-action option. The privilege escalation is used to solve a TryHackMe challenge. The root user calls tar via cron whi...

1 answer  ·  posted 2y ago by Matthias Braun‭  ·  last activity 10mo ago by Kamil Maciorowski‭

71%
+3 −0
What does `emerge --update --newuse --deep @world` have to do with package removal?

In Debian-based distributions, one can update the system with apt upgrade and cleanup unused dependencies with apt autoremove. Period. On Gentoo that is apparently not as straightforward. From G...

0 answers  ·  posted 2y ago by Quasímodo‭  ·  last activity 8mo ago by Mithical‭

40%
+0 −1
Why I can't use dark theme in Manjaro?

I was using Chrome for a moment in Manjaro. My theme was Adwaita dark which I chose from Tweaks. Suddenly, I noticed my theme was changed for no reason. I had updated my system 4-5 hours ago. When ...

1 answer  ·  posted 3y ago by deleted user  ·  last activity 3y ago by deleted user

60%
+1 −0
Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock'

I have installed mysql-server on Ubuntu 20.04 then I tried to sign into mysql-server using sudo mysql -u root but I have got Error: Can't connect to local MySQL server through socket '/var/run/mys...

2 answers  ·  posted 3y ago by Kevin M. Mansour‭  ·  last activity 3y ago by Kevin M. Mansour‭

71%
+3 −0
Is this a robust way to distinguish explicitly installed packages from those pulled in as dependencies?

When exploring the commands from this answer to my previous question, I found that the ist of packages includes a lot that were automatically installed due to dependencies. Obviously I'm interested...

1 answer  ·  posted 3y ago by celtschk‭  ·  last activity 3y ago by Peter Taylor‭

71%
+3 −0
Why does the file command fail to recognize non-text files as such?

POSIX defines Text file as A file that contains characters organized into zero or more lines. The lines do not contain NUL characters and none can exceed {LINE_MAX} bytes in length, inclu...

2 answers  ·  posted 3y ago by Quasímodo‭  ·  last activity 3y ago by LawrenceC‭

72%
+6 −1
How do I get lubuntu to not prompt non-admins about updates?

I have an old Mac Mini (Late 2009 model) kicking around, and as Apple stopped providing patches for it (and as I'm not going to put an unpatched system on the Internet), I was looking for a Linux d...

1 answer  ·  posted 3y ago by Peter Cooper Jr.‭  ·  last activity 3y ago by deleted user

60%
+1 −0
How to use Avro in Linux?

I am using Manjaro(Arch-based Linux). And, I had installed Avro using the following command by getting help of the documentation yay -S ibus-avro-git Avro is software using that software user w...

1 answer  ·  posted 3y ago by deleted user  ·  last activity 3y ago by deleted user