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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20
votes
3answers
2k views

How to prevent shutdown when an SSH user is logged in?

I'm administrating a networked environment and I had an interesting situation arise yesterday. When a host is required to shutdown by a regular user, it refuses to do so if other users are logged in ...
18
votes
6answers
21k 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 ...
8
votes
5answers
11k views

Dual monitors and panels

I have a question with regard to a multiple monitor setup. I'm currently primarily a Windows user, but I've been running Ubuntu in dual boot to get a feel for it. The one thing I find lacking that ...
12
votes
6answers
8k 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 ...
14
votes
7answers
3k 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 drive,...
14
votes
3answers
13k views

What is the proper way to manage multiple python versions?

I have a machine with Python 2.6 installed as the default Python. Then, I installed Python 2.7, and manually created /usr/bin/python as a symlink to the new installation. Then, I was running into ...
12
votes
5answers
23k views

Can't apply chmod to a file

I have a file on my HDD, cd /media/celebisait/5AC69788C6976355 There is my file called myFile.tar.gz. I do als -l, -rw------- 2 celebisait celebisait 1387745311 Jun 6 2013 myFile.tar.gz ...
11
votes
2answers
99k views

How to fix boot into initramfs prompt and “mount: can't read '/etc/fstab': No such file or directory” and “No init found”?

Installing a new system using a GPT partitioned disk dedicated to a single partition, ext4 formatted, extlinux (version 4.05) as bootloader, Ubuntu Core version 13.10 amd64 as rootfs, and Ubuntu linux-...
9
votes
1answer
6k views

How to launch an application with default “terminal emulator” on Ubuntu?

I wanted to execute some command in terminal emulator, like Konsole, but I need to make this cross-desktop. Is there some command like xdg-open, but for getting the default terminal emulator? I'm ...
9
votes
1answer
16k views

~/.xinitrc not being run

I am not able to run my ~/.xinitrc (~/.xsession) scripts when logging into my computer. I'm using Xubuntu 12.10 with vanilla lightgm as the login manager. Both these files have the right permission (...
8
votes
1answer
4k views

userns container fails to start, how to track down the reason?

When creating a userns (unprivileged) LXC container on Ubuntu 14.04 with the following command line: lxc-create -n test1 -t download -- -d $(lsb_release -si|tr 'A-Z' 'a-z') -r $(lsb_release -sc) -a $(...
6
votes
2answers
6k views

Gnome programs (eog/gnome-terminal) have a slow start and produce a DBus.Error.NoReply Warning

For some time eog and gnome-terminal are starting very slow on my (X)Ubuntu 13.10. I think other gnome tools are affected, too, but I don't use any else. Now I get a org.freedesktop.DBus.Error....
6
votes
1answer
29k views

Installing openjdk-7-jdk does not update java (which is still version 1.6)

I am having issues updating Java. I am running Ubuntu 11.10. I can execute sudo apt-get install openjdk-7-jdk and it completes successfully. javac -version is 1.7, however java -version is 1.6. This ...
28
votes
5answers
27k views

How can I play a sound when script execution is ready?

I am executing every now and then some python scripts which take quite long to execute. I execute them like this: $ time python MyScript.py How can I play a sound as soon as the execution of the ...
15
votes
5answers
10k views

How is sudo set to not change $HOME in Ubuntu and how to disable this behavior?

On Ubuntu 12.04, when I sudo -s the $HOME variable is not changed, so if my regular user is regularuser, the situation goes like this: $ cd $ pwd /home/regularuser $ sudo -s # cd # pwd /home/...
10
votes
3answers
5k 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
2answers
45k views

How do you fix apt-get update “Hash Sum mismatch”

I have an Ubuntu 12.04 virtual box vm that I instantiate using Vagrant. git clone https://github.com/spuder/puppet-gitlab vagrant up As soon as the vagrant box runs apt-get update, I get the ...
7
votes
1answer
12k views

Mounting an MTP enabled device on Ubuntu 12.04.3 LTS 32-bit

My aim is to perform file operations on my Samsung Galaxy Note 10.1 (older edition) using Ubuntu 12.04.3 LTS 32-bit. This does not work out of the box as I plugged my device and saw myself. In order ...
7
votes
4answers
8k views

Ctrl+C does not work in gnome-terminal

On my Linux host, Ctrl+C does not seem to work and I do not know how to proceed to make it work. I am using Ubuntu 10.04 with bash 4.1.5(1), and working in Gnome-terminal. When I pressed Ctrl+C while ...
6
votes
3answers
844 views

Effect of compiling from source on already installed applications

I use Ubuntu 12.04. Say I have installed package x from the repository (with all its dependencies) at version 1.7 but I need some functionality that is only available in version 1.8, so I download the ...
4
votes
1answer
388 views

Problems moving home partition

I was running low in disk space on my Linux box, Ubuntu 10.10 Desktop, (specifically on my /home partition) so I added another disk to it and I am trying to move the home partition into it. I am ...
4
votes
1answer
3k views

qemu - two clients (tap0 & tap1) via br0 can't ping eachother but server pings ok

I've got: A host system running Ubuntu with KVM (functional) Two clients, one Ubuntu and one Windows 7, nothing fancy. I've also setup (see below) a bridge via br0 for the clients: br0: 192.168....
4
votes
2answers
11k views

(L)ubuntu 12.04 syslog to custom file (not /var/log/syslog but /var/log/mylog) - ubuntu 12.04

I successfully tested the following syslog "hello world" example on ubuntu 12.04: // gcc giuspexample.c -o giuspexample #include <syslog.h> int main(int argc, char *argv[]) { setlogmask(...
3
votes
1answer
21k views

rtl8723be Realtek Wifi-Card driver not working on Ubuntu 14.04

I installed Ubuntu 14.04 on my new Lenovo G50-70. The wifi works perfectly in windows, however it behaves strangely on Ubuntu. It is slow, doesn't load heavier sites at all, and after a while, ...
14
votes
3answers
2k views

How can I de-fragment a drive using Ubuntu?

Is it necessary to defrag drives in Ubuntu? If so, how do I do it and how often should it be done?
13
votes
4answers
11k views

How to get rid of the “scanning for btrfs file systems” at start-up?

After upgrading from Ubuntu 12.04 to Ubuntu 12.10, I get a message "scanning for btrfs file systems" at starting-up. I don't have any BTRFS filesystem. It delays the booting for about 15 seconds. How ...
11
votes
5answers
18k 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.
8
votes
5answers
18k views

Why is this network connection so slow?

I am having some problems with network performance speed on a Linux server running Ubuntu 9.10. Transfer speeds on all types of traffic are around 1.5MB/s on a 1000mbit/s wired ethernet connection. ...
8
votes
1answer
2k views

How to write/edit/update the OsIndications efi variable from command line?

In the need to enter the UEFI firmware setup utility while using ultra fast boot (keyboard drivers are not loaded during POST), I wish to write to the "Os Indications" efi variable. My OS is Ubuntu 14....
8
votes
2answers
3k views

udev rule for assigning known symlinks for identical usb serial devices

I have two (and possibly in the future, more) USB serial devices which are identical (down to the serial number, unfortunately) - they're actually BTC miners. Currently they end up as ttyUSBX where X ...
8
votes
7answers
21k views

invalid SSL_version specified at /usr/share/perl5/IO/Socket/SSL.pm line 332

Since I upgraded my PC from (k)ubuntu 12.04 to 12.10 I receive this error message when trying to send an email using sendemail. Installing an older version of IO::Socket::SSL is not an option. I ...
8
votes
1answer
2k views

Can I use and install Ubuntu packages in Debian?

I'm looking to install Linux Mint on my main work computer. Presently, I'm running Ubuntu 10.04 on it after upgrading from 9.10 (both 64bit). Previously, I have always backed up and formatted my hard ...
7
votes
6answers
1k views

Negatives/downsides of Ubuntu's no-root sudo setup

By default, Ubuntu does not create a root account that the user can login to. Instead users use sudo when they need to perform actions that require administrative access. Obviously, the people at ...
7
votes
1answer
953 views

Automatically apply module patch and compile kernel when updated?

I've recently applied a one-line patch to drivers/bluetooth/btusb.c in order to enable compatibility with my Bluetooth device. However, whenever I get a kernel upgrade, the patch will be lost until ...
6
votes
4answers
6k views

Prevent claiming of novelty usb device by usbhid so I can control it with libusb?

I have a USB rocket launcher that I wish to experiment with through libusb. However, libusb cannot claim the interface; presumably because the output of usb-devices lists 'usbhid' as the driver for ...
6
votes
2answers
11k views

How to avoid powering down certain USB devices when a machine is suspended

I'd like to maintain power supply to a USB-powered drive when the system goes into suspend (AKA S3 or "suspend-to-RAM") mode. Normally the power is cut while the machine is suspended, which causes it ...
6
votes
3answers
4k views

Get diff changes between original files installed with apt and current files

I installed php5-fpm package using apt; then I made some changes to the PHP configuration files. Now I would get the diffs between the original files versions (the ones of the package installed) and ...
6
votes
3answers
961 views

Terminal change keys

Is it possible in the Unix terminal to change some of the keyboard keys? For example: when I press , then _ gets printed? If this is indeed possible, how do I go about doing that? I'm on Ubuntu.
5
votes
2answers
856 views

Sync files from a mac to a flash drive - automatically?

I have a flash drive, let's name it FLASH. I want, when on my mac, when FLASH is plugged (and automatically mounted), execute a specific script and make ~/Documents to be automatically copied to /...
5
votes
1answer
8k views

How to execute a shellscript when I plug-in a USB-device

I want to execute a script when I plug in a device in my Linux machine. For example, run xinput on mouse or a backupscript on a certain drive. I have seen a lot of articles on this, most recently ...
5
votes
1answer
2k views

Run a script after lid is opened

I would like to run a script after my laptop lid is opened. is there anything like rc.local that is run after the laptop wakes up after suspending? I use Ubuntu 12 (I need it because some of the ...
5
votes
1answer
6k views

Transferring Operating System from VM to Physical System

I have Ubuntu 13.04 running in a VM in VirtualBox. Originally, I was just trying it out, but now I've started using it a lot, and I have many of my programs and files in it. Is it possible to transfer ...
5
votes
1answer
2k views

Writing raw images safely to USB sticks

Trying lots of different linux, on all kinds of hardware I find my self typing commands like this quite often: sudo dd if=xubuntu-13.10-desktop-amd64.iso of=/dev/sdc bs=10240 Needless to say, ...
4
votes
2answers
1k views

How to see who is logged on to many workstations?

Before I go to work creating my own I would like to find an existing system to do the following: Provide a concise list of users logged on to any of the workstations Show workstation host name, IP, ...
4
votes
3answers
3k views

Mount NTFS Partition on Startup in Ubuntu

I have a 10 gigabyte partition which I use for files which I share between my Windows installation and my Oneiric Ocelet (Ubuntu) installation. My Eclipse workspaces exist on this partition. Eclipse ...
3
votes
3answers
18k views

Ubuntu make fails with No such file or directory /lib/modules/3.4.0/build

I am trying to build the CP210x driver for the 3.x.x kernel on ChrUbuntu. Build instructions: Ubuntu: make ( your cp210x driver ) cp cp210x.ko /lib/modules/<kernel-version>/kernel/drivers/...
3
votes
2answers
1k views

Can't do SSH public key login under encrypted home

I can't do ssh public key login to my server and I think this issue is related to the fact my home is encrypted. I chose the option "encrypt my home folder" under the Ubuntu install setup. The ...
3
votes
2answers
7k views

SSH + Sudo + Expect in Bash script: Run command with sudo in remote machine

I am trying to automate the deploy of some .deb packages with an script. I want to execute sudo dpkg -i $myDeb.deb in a list of remote machines I can access with ssh. I've tried to automate the ...
2
votes
3answers
11k views

can't start x11vnc without attached monitor

I'd like to setup x11vnc (or any other vnc server) to start at boot-time. The display manager is kdm, the distribution is Ubuntu 12.04.2 LTS. When I try to start x11vnc, I'm getting this errors: $ ...
2
votes
3answers
1k views

Why does the adduser command behave surprisingly?

I see various examples of how to add a user on Ubuntu server I have Ubuntu 10.04.2 LTS I was logged in as root and, when running adduser, my SSH command line asked me for both a 'new password' AND ...