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1500 questions
314
votes
18 answers
How to modify an invalid '/etc/sudoers' file?
How do I edit an invalid sudoers file? It throws the below error and it's not allowing me to edit again to fix it.
Here is what happens:
$ sudo visudo
>>> /etc/sudoers: syntax error near line 28 <<<
sudo: parse error in /etc/sudoers near line…
user25165
314
votes
9 answers
How can I fix a 404 Error when using a PPA or updating my package lists?
PPA seems to be constantly offline. Whenever I use sudo apt-get update, this error is shown:
W: Failed to fetch http://ppa.launchpad.net/ 404 Not Found
How do I fix these errors?
Pedro
- 3,141
314
votes
10 answers
What is the difference between Terminal, Console, Shell, and Command Line?
What is the difference between Terminal, Console, Shell, and Command Line?
Anon
- 12,063
- 23
- 70
- 124
314
votes
10 answers
How do I find my internal ip address?
I have Ubuntu server 12.04 installed, so I have no GUI. When I do the command ifconfig, I cannot find my internal IP address. It says: inet addr: 127.0.0.1.
Here is the output of ifconfig -a:
eth0 link encap:Ethernet HWaddr 00:06:4f:4a:66:f0
…
Cam Jones
- 3,741
- 10
- 23
- 26
313
votes
15 answers
How can you log out via the terminal?
Is there a terminal command that will log you out of your current desktop session and take you back to the login screen?
TheXed
- 26,536
312
votes
8 answers
How can I create a zip archive of a whole directory via terminal without hidden files?
I have a project with lots of hidden folders / files in it. I want to create a zip-archive of it, but in the archive shouldn't be any hidden folders / files. If files in a hidden folder are not hidden, they should also not be included.
I know that…
Martin Thoma
- 19,277
312
votes
3 answers
How to unzip .tgz file using the terminal?
I've downloaded mongodb-linux-x86_64-2.6.3.tgz file using windows 7 and kept it on D:\Amra\Software\Developing Soft location.
When I right click this .tgz file using Ubuntu and see property it shows Location: /media/towhid/Amra/Software/Developing…
Towhid
- 4,035
312
votes
12 answers
How to uninstall a .deb package?
Suppose I download a .deb package from a website and install it. (I assume that when I double click the .deb file, the package is installed through a GUI that interfaces with dpkg right?)
How can I uninstall it?
Olivier Lalonde
- 58,691
312
votes
10 answers
How can I tell, from the command line, whether the machine requires a reboot?
When you install certain updates (e.g. a new kernel) in Ubuntu Desktop, you get an indication that a reboot is required (in Lucid, the logout icon turns red).
How can I check, from the command line, whether an Ubuntu server requires a reboot?
I…
Marius Gedminas
- 11,340
311
votes
10 answers
How can I set up password-less SSH login?
I want to be able to login to a remote via ssh without having to enter the password all the time.
How do I set it up?
Is a different command required to execute a password-less session?
Oxwivi
- 17,849
309
votes
4 answers
How do I diff the output of two commands?
I had imagined the simplest way to compare the contents of two similar directories would be something like
diff `ls old` `ls new`
But I see why this doesn't work; diff is being handed a big long list of files on the command line, rather than two…
Ternary
- 3,987
307
votes
13 answers
What software can I use to view epub documents?
What software can I use to view .epub documents?
Olivier Lalonde
- 58,691
307
votes
11 answers
How can I uninstall software?
Seeing there are various ways to install on Ubuntu. What are the various ways to uninstall items?
Which ways always work? How can I be sure something was uninstalled?
myusuf3
- 34,189
306
votes
2 answers
What is hardware enablement (HWE)?
I see the linux-hwe-generic package as part of the kernels you can install in Ubuntu.
What is hardware enablement (HWE)?
nelaaro
- 10,028
305
votes
10 answers
Is FFmpeg missing from the official repositories in 14.04?
I tried to install ffmpeg in trusty/Ubuntu 14.04 and got the following message:
$sudo apt-get install ffmpeg
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package ffmpeg is not available, but is…
user254877
- 3,061
- 2
- 13
- 6