Category Archives: Ubuntu/Debian

failed to execute ‘/lib/udev/socket:@/org/freedesktop/hal/udev_event’ ‘socket:@/org/freedesktop/hal/udev_event’

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Problem

Looking at your /var/log/syslog you see entries every few seconds like the following:

Mar  1 15:44:52 L530 systemd-udevd[11464]: failed to execute '/lib/udev/socket:@/org/freedesktop/hal/udev_event' 'socket:@/org/freedesktop/hal/udev_event': No such file or directory
Mar  1 15:44:52 L530 systemd-udevd[11451]: Process 'socket:@/org/freedesktop/hal/udev_event' failed with exit code 2.
Mar  1 15:44:54 L530 systemd-udevd[11479]: failed to execute '/lib/udev/socket:@/org/freedesktop/hal/udev_event' 'socket:@/org/freedesktop/hal/udev_event': No such file or directory
Mar  1 15:44:54 L530 systemd-udevd[11466]: Process 'socket:@/org/freedesktop/hal/udev_event' failed with exit code 2.

Solution

Seems that hal is not used in newer Ubuntu versions, so you can remove it:

sudo apt-get purge hal

Taken from the answer here

ERROR: could not open extension control file “/usr/share/postgresql/9.3/extension/plr.control”: No such file or directory

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Problem

You are trying to install the PL/R extension to PostgreSQL, after install R in your linux ubuntu development environment, but when trying to install the extension inside your PostgresSQL with:

create extension plr;

you are getting the following error:

ERROR:  could not open extension control file "/usr/share/postgresql/9.3/extension/plr.control": No such file or directory

Solution

Install the necessary package for your PostgreSQL version with the following, and install the extension in your psql:

sudo apt-get install postgresql-9.x-plr

No PostgreSQL clusters exist; see “man pg_createcluster”

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Problem

After installing postgresql in a new Ubuntu 14.04 installation you get the error:

No PostgreSQL clusters exist; see "man pg_createcluster"

and when you try to start the server with:

sudo service postgresql start

you get the error that the server does not exist:

psql: coud not create to server: No such file or directory ...

Solution

The solution can be found in the article here, and is to create manually the first cluster by:

sudo pg_createcluster 9.3 main

Fixing a broken sudoers file without rebooting

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Problem

If by accident you make a mistake in your sudoers file then you won’t be able to run sudo command after saving the file.

Solution

Following the answer here, you can simply run the command pkexec visudo, supply your password and provided you already had sudo permissions, fix the sudoers file, make sure that you save it using the Q when prompted, and you should be able to use sudo commands again.

Docker error – error response from daemon: Cannot start container….is not within /var/lib/docker/aufs/mnt

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Problem

You are trying to use an image from Docker in your Ubuntu 14.04 system, but you are getting a error like the following:

014/12/13 17:10:23 Error response from daemon: Cannot start container 4023610855c0551bdc44d0e602f20999c0527da3cfe010169707248887b3a1f0: /var/lib/docker/aufs/mnt/4023610855c0551bdc44d0e602f20999c0527da3cfe010169707248887b3a1f0 is not within /var/lib/docker/aufs/mnt/4023610855c0551bdc44d0e602f20999c0527da3cfe010169707248887b3a1f0

Solution

Your docker version is outdated (ie 1.0.1) so you would need to upgrade your docker installation.
There is a script for this (information from here):

After running the following you should be able to use your images as normal with: sudo docker run -t -i image/name bin/bash:

$ curl -s https://get.docker.io/ubuntu/ | sudo sh

rvm – Branch origin/ruby_2_1_0 not found.

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Problem

You are trying to install the new ruby in your ubuntu rvm installation with rvm install 2.1 but you are getting the error:

Branch origin/ruby_2_1_0 not found.
There has been an error while checking out branch ruby_2_1_0.
Halting the installation.                               
There has been an error fetching the ruby interpreter. 
Halting the installation.

Solution

If you are careful and you notice a warning message as:

Warning, new version of rvm available '1.25.26', 
you are using older version '1.24.8'.

then you would need to update your rvm installation to the latest one with:

rvm update

And then you should be able to install the latest ruby version with:

rvm install 2.1

WARNING: Nokogiri was built against LibXML version 2.9.0, but has dynamically loaded 2.9.1

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Problem

You get the following warning after an update to your system (ie Ubuntu 13.10):

WARNING: Nokogiri was built against LibXML version 2.9.0, but has dynamically loaded 2.9.1

Solution

Uninstall your nokogiri versions:

gem uninstall nokogiri

and then run install it again (inside your application if you use bundler) with:

bundle install

rvm “You need to change your terminal emulator preferences to allow login shell.”

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Problem

After a new rvm installation in an (k)ubuntu system you get the following error from rvm when trying to switch between rubies:

You need to change your terminal emulator preferences to allow login shell.
Sometimes it is required to use `/bin/bash --login` as the command.
Please visit https://rvm.io/integration/gnome-terminal/ for a example.

Solution

As the message suggests you can change the setting in your terminal which is fine if you are using the gnome-terminal by going to the link provided:

Please visit https://rvm.io/integration/gnome-terminal/ for a example.

but if you are using Konsole in KDE you need to go to a different link that explains the change in the settings:

Please visit http://rvm.io/integration/konsole/ for a example.