Ubuntu is a Linux distribution with an emphasis on ease of use and installation. Note that http://askubuntu.com is specifically dedicated to Ubuntu questions.

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5answers
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keyserver timed out when trying to add a GPG public key

I am trying to add a public key for installing a program with CPG. But i am pretty new to this but every command i found gave me the same error: gpg --keyserver keyserver.ubuntu.com --recv-keys ...
13
votes
7answers
14k views

Linux equivalent for Windows Startup

Is there any way to add an application/script to the Linux startup so every time the system is on it executes [i'm looking for some automated way, user should not add this by cron job or something ...
13
votes
2answers
4k views

Why is vi apparently broken (viminfo error E576), and how can I fix it?

I am proficient at using Unix/Linux, but I am not an expert. If I want to open a file (for example, file.txt), I use vi: vi file.txt This opens the file, and if I want to close it, I use :q!. I ...
13
votes
1answer
10k views

How do I set a user's default .bashrc file?

On Ubuntu 10.4 I have edited the /etc/bash.bashrc file to set some variables like the command history size (HISTSIZE=5000), however if I create a new users Ubuntu by default gives them a .bashrc file ...
13
votes
1answer
2k views

How do I make my laptop sleep when it reaches some low battery threshold?

I'm using Ubuntu, but I have i3 as my window manager. Under i3, when my battery reaches 0%, the computer will just abruptly shut down, no warning or anything. Is there a simple script or ...
12
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3answers
42k views

How to start a service automatically, when Ubuntu starts?

I am using Ubuntu 12.04 and want to have a service starting, when the system is booted normally. As 'service' I understand some code, for example cd my_directory; my_command -host 0.0.0.0 -port ...
12
votes
4answers
5k views

How is Ubuntu based on Debian?

Linux Mint is based on Ubuntu. Ubuntu is based on Debian. Like this, there are several other linux distributions that are based on Ubuntu, Debian, Slackware, etc. What confuses me is what does this ...
12
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3answers
16k views

Linux, disable /dev/fd0 (floppy)

Is it possible to make Linux kernel completely ignore the floppy disk controller? I do not have the drive but obviously my motherboard does contain the controller. I would like to disable the /dev/fd0 ...
12
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4answers
9k views

Mount a filesystem read-only, and redirect writes to RAM?

Is it possible to mount a loopback file as read-only, and redirect all writes to RAM?
12
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7answers
24k views

Finding files that use the most disk space

Is it possible to list the largest files on my hard drive? I frequently use df -H to display my disk usage, but this only gives the percentage full, GBs remaining, etc. I do a lot of data-intensive ...
12
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4answers
17k views

XFS vs Ext4 vs Others - which file system is stable, reliable, for long run such as 24/7 case [closed]

XFS and Ext4 file system which one is really stable and reliable for long run with heavy disk write and read? the system will be used in a place where 24/7 is in service, and every second there is ...
12
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3answers
5k views

Why don't my arrow keys work in sh?

I recently installed Ubuntu and when I run sh on the Terminal my arrow keys don't work so I can't go through my call history or edit whatever I'm typing. It just comes out as weird characters like ...
12
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2answers
68k views

How to recover files I deleted now by running rm *? [duplicate]

By mistake I ran rm * on the current directory where I created many c program files. I had been working on these since morning. Now I can't take out again the time that I spent since morning on ...
12
votes
3answers
18k views

How to configure external IP addresses for LXC guests?

I'm exploring the LXC features in Ubuntu 12.04 and I really want to set up a network like this: client1: 192.168.56.101/24 lxc-host: 192.168.56.102/24 guest1 192.168.56.201/24 guest2 ...
12
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4answers
2k views

In Debian based systems, how do we purge configuration files of packages that have already been uninstalled?

To be more specific, I would like to do the equivalent of adding the --purge flag to the following command sudo apt-get autoremove --purge [package name] to packages that are no longer on the ...
12
votes
5answers
7k views

Screen turns on automatically (xset dpms force off)

I am using xset dpms force off to manually turn my screen off to save power. However, it turns back on after some time (20 - 40 seconds). Distro: Ubuntu-Lucid Graphics: Intel 4500 MHD ...
12
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6answers
14k views

How can I switch between different audio output hardware using the shell?

I use my laptop with an external monitor which has speakers. When the monitor is attached through HDMI I can switch (using the GUI: Sound Setting --> Hardware) between the normal laptop audio output ...
12
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1answer
5k views

Installing two glibc alongside in debian/ubuntu

Is it possible to install and use two different glibc versions on the same machine. Where one version is only used to run legacy software, which relies on old glibc binaries? Is it possible to do ...
11
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5answers
585 views

Is there a more succinct alternative to piping to wc for counting files in a directory

If I do ls -1 target_dir | wc -l, I get a count of files in a directory. I find this a bit cumbersome. Is there a more elegant or succinct way?
11
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3answers
4k views

l, ls & la — what are the differences, and are there more of these commands?

So, through typing several commands I've found that there's not only ls, but l and la too. There doesn't appear to be any man entries on Ubuntu 12.14. They all appear to do similar things with minor ...
11
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3answers
32k views

Trying to SSH to local VM Ubuntu with putty

I have found similar questions in my searches here, but most of the answers are way above me at the moment, so here goes. I have set up a VM of Ubuntu server, have installed OpenSSH, and am now ...
11
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4answers
10k views

'mv' equivalent of drag and drop with replace?

In a GUI environment, a drag-and-drop with replace will replace files and entire directories (including contents) with whatever is being copied in. Is there a way to accomplish this same intuitive ...
11
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7answers
2k views

Can I label a disk device rather than a partition?

I know about the e2label and friends program for attaching a label to a disk partition e.g. e2label /dev/sda1 bla What I want to do is something different: I want to create a label for a hard ...
11
votes
2answers
3k views

Can I unfreeze bash or vim when SSH session freezes from timeout? [duplicate]

When my SSH session times out, the whole terminal freezes. Is there any way to break out of that connection? CTRL+C doesn't cut it.
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2answers
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How to implement package install suggestion on Debian?

I have noticed that while on Ubuntu, if I type the following: mc and it isnt installed, I get the message below: The program 'mc' is currently not installed. You can install it by typing: sudo ...
11
votes
1answer
3k views

Using Atlas from scipy

I installed Ubuntu 12.04 64 bit. I need to work with python and scipy, I installed them and when I run the test: python -c "import scipy; scipy.test()" I get the message: ImportError: ...
11
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4answers
22k views

Ubuntu 12.04 hotspot wifi network not visible to Android 4.1.2

I'm running Ubuntu 12.04 LTS on my notebook, and I've got a Motorola Razr which I updated to Android 4.1.2. Before updating, I connected my smartphone to my hotspot wifi very quickly, but after the ...
11
votes
2answers
15k views

How to boot EFI kernel using QEMU (kvm)?

Hey guys I'm trying to emulate a EFI enviroment using QEMU (kmv), virtualbox takes 15 minutes to boot in EFI mode using archboot. Using legacy BIOS mode I can boot using this command: ...
11
votes
1answer
8k views

swapon: Operation not permitted

I'm running this as root, obviously. I've created a file called /swap/sw1, by dumping 512 megs of /dev/zero into it. I then ran mkswap, which said: Setting up swapspace version 1, size = 524284 KiB ...
11
votes
2answers
593 views

Removing abstraction from Ubuntu boot process

I have been using Linux after almost 5 years and observed that boot process has been almost abstracted. I mean, not much is visible to the user what is going on behind the scenes (Due to splash ...
11
votes
2answers
10k views

Overflow /tmp mounted when there is free space on /

I recently faced an "overflow" issue on /tmp. I don't have a separate /tmp partition, and there is 17% free in / – then why did I get an overflow tmp filesystem? # /etc/fstab: static file ...
11
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5answers
17k views

How do I set up dual monitor wallpaper (Ubuntu/NVIDIA)?

On Ubuntu 10.4 with NVIDIA drivers I have dual monitors setup with TwinView. How do I configure a single wallpaper to span both monitors? Right now the same wallpaper is replicated on both monitors. ...
11
votes
1answer
3k views

How can I monitor CPU usage by user?

I need to monitor CPU usage by users of two servers' (Ubuntu and CentOS). For example: user1 5% user2 10% ... Is there a tool similar to top or htop that can do that?
11
votes
1answer
2k views

is upstart and supervisord used for the same thing?

I have a some jvm based processes that I need to make sure start whenever my server is rebooted, and also if it stops because of an unexpected error etc. I'm running Ubuntu 12.04 in case in matters. ...
11
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2answers
2k views

Is it possible to simulate installation of Debian packages, still marking them installed?

Here's what I would like. Start with a virtual system with no installed packages. Then I invoke a tool similar to apt-get to ask it to compute the dependencies and mark all the packages that would be ...
11
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3answers
700 views

Ubuntu - No space left on device (NTFS)

I have a server which stores a lot of data, I keep many nested directories with millions of files in them. While trying to move one big directory (~700GB) from one disk to another I get an error: mv ...
10
votes
3answers
3k views

How do I log into my Linux laptop if I have forgotten both the login and password?

How do I log into my Linux laptop if I have forgotten both the username and password?
10
votes
4answers
2k views

Use #!/bin/sh or #!/bin/bash for Ubuntu-OSX compatibility and ease of use & POSIX

I know that I can use either as the first line of scripts to invoke the desired shell. Would #!/bin/sh be recommended if compatibility with all unix systems is an absolute requirement? In my case ...
10
votes
3answers
14k views

The rc0.d,rc1.d,… directories in /etc

I'm running Ubuntu 10.04 LTS where I have the directories /etc/rc0.d, /etc/rc1.d, /etc/rc2.d, ..., /etc/rc6.d. Example files from my machine: directory example symlinks in the dir ...
10
votes
5answers
19k views

Can a linux user change their password without knowing the current password?

I'm setting up a few ubuntu boxes, and using opscode's chef as a configuration tool. It would be fairly easy to install public keys for each user on each of these servers, and disable password ...
10
votes
3answers
27k views

Creating an user without a password

I'm trying to create user without password like this: sudo adduser \ --system \ --shell /bin/bash \ --gecos ‘User for managing of git version control’ \ --group \ --disabled-password \ ...
10
votes
2answers
11k views

Configuring syslogd in Ubuntu

In CentOS and many other distros you can configure syslogd using /etc/syslog.conf but in Ubuntu there is no such file. Which file I should edit for configuring syslogd in Ubuntu.
10
votes
4answers
22k views

How to find out if Ubuntu is using DHCP (Ubuntu 12.04 LTS GUI)

How can I find out if my IP address is DHCP, Fixed or Dynamic? I need to tell my network administrator what the IP address is, that my Virtual Machine is using. I know the numbers, but I don't know ...
10
votes
3answers
5k views

How to /dev/null background processes “informational” output?

[USER@SERVER ~] sleep 3 & [1] 5232 [USER@SERVER ~] [1]+ Done sleep 3 [USER@SERVER ~] How do I /dev/null these two messages?: [1] 5232 [1]+ Done sleep ...
10
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1answer
15k views

How to permanently disable a network interface?

I've brought down a network interface with ifconfig wlan0 down, but every few hours or so, the wlan0 interface comes back up and I can't figure out why. I don't restart the machine, never changed ...
10
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3answers
19k views

Ubuntu Server Continuously “goes to sleep”

I am running a web server at home using Ubuntu 11.4 (maybe? I can't 100% recall) on an older AMD 2400+ desktop with 1 or 2 GB of RAM. Sorry I can't recall the details 100%. Anyway, I have a KVM ...
10
votes
4answers
10k views

I changed my hostname, why is my bash PS1 prompt unchanged

I changed my hostname by editing /etc/hostname and can see the new hostname using the hostname and hostname -F commands. But the shell prompt is still showing the old hostname. This is Ubuntu 11.0.4 ...
10
votes
3answers
12k views

How can I track who SSH'es into my linux machine?

I'm running Ubuntu 10.04. Is there a way I can get a daily report of who has logged onto the box, what time, and even - this may be asking too much - a report of the commands they used? This is a ...
10
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5answers
12k views

Why is this python error message generated whenever I type a nonsense command?

Whenever I type any "nonsense" command, this python error message is generated. Normal commands work fine. Any idea how to debug this? $ somenonexistingcommand Traceback (most recent call last): ...
10
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2answers
2k views

Launchpad equivalent for Debian

I am thinking of switching to Debian (Squeeze) from Ubuntu (10.10). But these questions have been bugging me: Is there a Launchpad equivalent repository for Debian? I am not able compile packages ...