All Questions

1635
votes
22answers
2.8m views

How to list all installed packages

I'd like to output a list of all installed packages into a text file so that I can review it and bulk-install on another system. How would I do this?
1207
votes
9answers
3.9m views

How to unzip a zip file from the Terminal?

Just downloaded a .zip file from the internet. I want to use the terminal to unzip the file. What is the correct way to do this?
1102
votes
26answers
1.2m views

How can PPAs be removed?

I've added many PPAs using the add-apt-repository command. Is there a simple way to remove these PPAs? I've checked in /etc/apt/sources.list for the appropriate deb lines but they aren't there. This ...
1038
votes
9answers
3.1m views

How do I install a .deb file via the command line?

How do I install a .deb file via the command line?
894
votes
21answers
2.8m views

Unable to lock the administration directory (/var/lib/dpkg/) is another process using it?

I get this error when trying to use apt-get: E: Could not get lock /var/lib/dpkg/lock - open (11 Resource temporarily unavailable) E: Unable to lock the administration directory (/var/lib/dpkg/) is ...
835
votes
15answers
1.7m views

How to get bash or ssh into a running container in background mode?

I want to ssh or bash into a running docker container. Please, see example: $ sudo docker run -d webserver webserver is clean image from ubuntu:14.04 $ sudo docker ps CONTAINER ID IMAGE ...
774
votes
7answers
1.0m views

How to enable or disable services?

I read about how to enable and disable services in Ubuntu and it seems that there are different possibilities to manage them. The first method I found is update-rc.d to add new services to startup, ...
767
votes
7answers
2.5m views

How can I add a new user as sudoer using the command line?

After I add a user using adduser, I can't see it via System > Administration > Users and Groups unless I log out and then log in again. Is that normal? Also, can I set a newly added user as a sudoer ...
749
votes
5answers
2.1m views

How do I shut down or reboot from a terminal?

How can I shut down or reboot Ubuntu using terminal commands?
746
votes
8answers
2.8m views

A command to list all users? And how to add, delete, modify users?

I need a command to list all users in terminal. And how to add, delete, modify users from terminal. That could help in administrating your accounts easily by terminal.
744
votes
6answers
795k views

How to upgrade a single package using apt-get?

How do I update a single package? As far as man apt-get says apt-get upgrade doesn't take a package/list of packages as parameter: upgrade upgrade is used to install the newest versions of all ...
741
votes
16answers
604k views

“The following packages have been kept back:” Why and how do I solve it?

I just added a PPA repository for the development version of the GIMP, but I get this error: $ apt-get update && apt-get upgrade ... The following packages have been kept back: gimp gimp-...
713
votes
82answers
518k views

What Application Indicators are available?

This question exists because it has historical significance, but it is not considered a good, on-topic question for this site, so please do not use it as evidence that you can ask similar questions ...
712
votes
11answers
796k views

How do I determine the total size of a directory (folder) from the command line?

Is there a simple command to display the total aggregate size (disk usage) of all files in a directory (folder)? I have tried these, and they don't do what I want: ls -l, which only displays the ...
685
votes
12answers
1.4m views

How do I uncompress a tarball that uses .xz?

I'm used to extracting tarballs with a -xfz flag, which handles gzip and bzip2 archives. Recently I've run into a .tar.xz file and I would like to uncompress it in one step using tar, how can I do ...
674
votes
7answers
2.3m views

What command do I need to unzip/extract a .tar.gz file?

I received a huge .tar.gz file from a client that contains about 800 mb of image files (when uncompressed.) Our hosting company's ftp is seriously slow, so extracting all the files locally and sending ...
670
votes
37answers
1.0m views

How do I remove old kernel versions to clean up the boot menu?

Every time I install a new Linux kernel, it gets left in the grub_config, making the boot menu longer each time. I know I can manually search through the installed packages and remove them. Does ...
666
votes
3answers
620k views

How can I use docker without sudo?

On Docker's documentation pages, all example commands are shown without sudo, like this one: docker ps On Ubuntu, the binary is called docker.io. It also does not work without sudo: sudo docker.io ...
665
votes
19answers
829k views

Error message 'sudo: unable to resolve host <USER>'

When I run sudo the terminal is stuck for a few seconds and then outputs an error message. My terminal looks like this: ubuntu@(none):~$ sudo true sudo: unable to resolve host (none) What can I do ...
646
votes
17answers
1.1m views

How to add a directory to the PATH?

How do I add a directory to the $PATH in Ubuntu and make the changes permanent?
636
votes
7answers
1.3m views

Where is the cron / crontab log?

I want to verify that my cron job is executing and at what time. I believe there is a log for my sudo crontab -e jobs, but where? I searched google and found recommendations to look in /var/log (...
604
votes
9answers
2.0m views

How to install updates via command line?

When I log into my web server via SSH I see the information: 88 packages can be updated. 80 updates are security updates I tried apt-get update then apt-get upgrade but each time I log in I still ...
603
votes
15answers
2.1m views

How do I reset a lost administrative password?

I'm working on a Ubuntu system, and my client has completely forgotten his administrative password. He doesn't even remember entering one; however it is there. I've tried the suggestions on the ...
599
votes
6answers
844k views

How to extract files to another directory using 'tar' command?

I thought tar archive.tar /users/mylocation would work, but it doesn't. How can I do that?
592
votes
7answers
1.0m views

How to add existing user to an existing group?

I want to add the Apache user (www-data) to the audio group. I've read the man page for useradd, but I'm not having any luck. I'm running xubuntu 11.10. Here's what I'm doing: $ sudo useradd -G audio ...
579
votes
44answers
553k views

What should I do when Ubuntu freezes?

All operating systems freeze sometimes, and Ubuntu is no exception. What should I do to regain control when... just one program stops responding? nothing at all responds to mouse clicks or key ...
567
votes
19answers
849k views

How do you monitor the progress of dd?

dd is a wonder. It lets you duplicate a hard drive to another, completely zero a hard drive, etc. But once you launch a dd command, there's nothing to tell you of its progress. It just sits there at ...
563
votes
5answers
1.7m views

How can I copy the contents of a folder to another folder in a different directory using terminal?

I am trying to copy the contents of a folder to another folder in a different directory using terminal. Would somebody be able to provide me an example of the command line syntax required to achieve ...
557
votes
5answers
3.1m views

How to delete a non-empty directory in Terminal?

How do I delete the following directory? I typed: rmdir lampp This error comes up: rmdir: failed to remove `lampp': Directory not empty Is there a command to delete all the files in the directory ...
552
votes
23answers
1.2m views

Command for determining my public IP?

If I check with google, I can see my public IP. Is there something on the Ubuntu command-line which will yield me the same answer?
550
votes
14answers
544k views

How to keep processes running after ending ssh session?

Let's say I launch a bunch of processes from a ssh session. Is it possible to terminate the ssh session while keeping those processes running on the remote machine?
539
votes
34answers
544k views

Unity doesn't load, no Launcher, no Dash appears

When I login, nothing happens. I am presented with my desktop wallpaper. No Dash, no Launcher, nothing.
538
votes
27answers
837k views

How can I install Sun/Oracle's proprietary Java JDK 6/7/8 or JRE?

I want to install Oracle's JRE and to update to the latest version with the Software Updater when they released. Is there a Ubuntu package that is provided by Canonical or Oracle? Before release Java ...
538
votes
12answers
1.7m views

How do I install Ubuntu alongside a pre-installed Windows with UEFI?

I'm absolutely new to Linux. I would like to know how to install Ubuntu alongside the pre-installed Windows 8+ OS. Should I do it with Wubi, or through the Live USB/DVD? What steps do I need to take ...
536
votes
21answers
544k views

How do I free up more space in /boot?

My /boot partition is nearly full and I get a warning every time I reboot my system. I already deleted old kernel packages (linux-headers...), actually I did that to install a newer kernel version ...
530
votes
23answers
369k views

How can I record my screen?

How can I record my screen on Ubuntu? The app I'm looking for has ideally all of these features: Can record in a format that can be played back easily on any platform and/or accepted by YouTube or ...
522
votes
11answers
830k views

How can I update my nodeJS to the latest version?

I have installed nodeJS on Ubuntu with following code sudo apt-get install nodejs Since I am a new user for ubuntu I also ran this code too sudo apt-get install npm Now when I type nodejs --...
516
votes
11answers
422k views

What are Unity's keyboard and mouse shortcuts?

In Unity, are there any pre-defined shortcuts, e.g. to open the dash or unhide the launcher?
513
votes
14answers
840k views

How do I resolve unmet dependencies after adding a PPA?

Occasionally, when I'm installing stuff, I get an error like the following: Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the ...
503
votes
8answers
1.3m views

What is the correct way to completely remove an application?

I've searched the net for such information and found different command lines, like these ones: sudo apt-get remove application sudo apt-get remove application* sudo apt-get remove --purge ...
502
votes
7answers
952k views

How do I set up a Cron job?

I want to schedule a task to run on a regular basis and have heard that Cron is the way to do this. How do I add Cron jobs in Ubuntu?
497
votes
10answers
596k views

What are PPAs and how do I use them?

I keep reading about Personal Package Archives ('PPAs') and people answer questions with a link to a PPA. What's the best way to use these? There are multiple valid answers for this question ...
493
votes
6answers
2.0m views

How do I rename a directory via the command line?

I have got the directory /home/user/oldname and I want to rename it to /home/user/newname. How can I do this in a terminal?
491
votes
5answers
1.1m views

How do I search for available packages from the command-line?

I have successfully installed some packages using the command line 'sudo apt-get install ...' when I have known in advance that those packages are available. But how can I search for or get a list of ...
488
votes
7answers
997k views

How to increment a variable in bash?

I have tried to increment a numeric variable using both var=$var+1 and var=($var+1) without success. The variable is a number, though bash appears to be reading it as a string. Bash version 4.2.45(1)...
483
votes
7answers
1.0m views

Find and replace text within a file using commands

How can I find and replace specific words in a text file using command line?
479
votes
14answers
872k views

How do I change the hostname without a restart?

I want to change the OS hostname but I do not want to restart. I have edited /etc/hostname but it requires a restart to get implemented. How to avoid this?
476
votes
18answers
824k views

How do I fix my locale issue?

I am getting this message every time I do something like starting or stopping a service. perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: ...
475
votes
9answers
850k views

How to run scripts on start up?

How can I run scripts automatically when Ubuntu starts up so I don't have to run them manually after startup?
467
votes
46answers
842k views

Why crontab scripts are not working?

Often, crontab scripts are not executed on schedule or as expected. There are numerous reasons for that: wrong crontab notation permissions problem environment variables This community wiki aims to ...

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