Kill all processes of a user

The following command will kill all processes belong to a single user on Linux.

pkill -u username

Credit: Linux – Kill all processes for a user


Banshee crashes: The database disk image is malformed

Banshee just crashed on me with the following error message:

[Info  20:44:59.949] Running Banshee 1.6.1: [Ubuntu 10.04 LTS (linux-gnu, x86_64) @ 2010-06-18 18:47:49 UTC]
[Info  20:45:01.043] All services are started 0.949921
Exception has been thrown by the target of an invocation.
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> Mono.Data.Sqlite.SqliteException: The database disk image is malformed
database disk image is malformed
at Mono.Data.Sqlite.Sqlite3.Reset (Mono.Data.Sqlite.SqliteStatement stmt) [0x00000]
at Mono.Data.Sqlite.Sqlite3.Step (Mono.Data.Sqlite.SqliteStatement stmt) [0x00000]
at Mono.Data.Sqlite.SqliteCommand.ExecuteNonQuery () [0x00000]
at (wrapper remoting-invoke-with-check) Mono.Data.Sqlite.SqliteCommand:ExecuteNonQuery ()
at Hyena.Data.Sqlite.HyenaSqliteCommand.Execute (Hyena.Data.Sqlite.HyenaSqliteConnection hconnection, Mono.Data.Sqlite.SqliteConnection connection) [0x00000]
--- End of inner exception stack trace ---

I think this is how it happened. My computer hanged while Banshee was running, and I had to force reboot it.  Hence, the Banshee database file was corrupted. Thanks to boombox1387 from Ubuntu forum, this problem can be fixed as the following:

Install sqlite3:

sudo apt-get install sqlite3

Then run:

cd ~/.config/banshee-1

Dump the database in an SQL text format:

sqlite3 banshee.db ".dump" > dump

Backup the (corrupted) database:

mv banshee.db banshee.db.backup

Create and restore a database from dump file:

cat dump | sqlite3 banshee.db

Banshee started up again. Both files: dump and banshee.db can be removed.

Credit: [ubuntu] Banshee Crashed

Amarok 2.3.0 and PulseAudio Problem

Ever since I upgraded my Ubuntu desktop from 9.04 to 10.4, I have been having problems with Amarok dropping sound randomly. For example, if Amarok is playing the music and another program requires to use sound, Amarok will become silence.

One solution to restore sound in Amarok is to kill pulseaudio and restart Amarok. It works, but very annoying.

Fortunately, installing libxine1-gnome and configure Amarok to use Esound (ESD) instead of PulseAudio fixed the problem.

Thanks to this bug report

How to tell which Linux distro you’re running


Thanks to Jayen, there is a better way:

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 9.10
Release: 9.10
Codename: karmic

$ cat /etc/issue
Debian GNU/Linux squeeze/sid \n \l


$ cat /proc/version
Linux version 2.6.32-trunk-686 (Debian 2.6.32-5) ( (gcc version 4.3.4 (Debian 4.3.4-6) ) #1 SMP Sun Jan 10 06:32:16 UTC 2010

Source: Which Linux Distro are you using??

Stopping hard drive clicking noise on MSI U100

Finally, the OS X has been removed from MSI Wind U100, and completely replaced by Debian (testing).

Whenever the computer is idle, the hdd makes this weird clicking noise. To stop it, we can use hdparm to turn it off.

kenno@tora:~$ sudo hdparm -B 254 /dev/sda

setting Advanced Power Management level to 0xfe (254)
APM_level = 254

Source: MSI Wind – Gentoo Linux Wiki

FIXED: extconf.rb:8:in `require’: no such file to load — mkmf (LoadError)

While reading Linux Journal Issue 181 today, I stumbled upon a section explaining about running Ruby on Rails on Apache using an Apache module called Phusion Passenger, also known as mod_rails.

To install Passenger, I followed the instruction provided in the magazine:

sudo gem install passenger

Unxpectedly, I got the following error:

Building native extensions. This could take a while...
ERROR: Error installing passenger:
ERROR: Failed to build gem native extension.

/usr/bin/ruby1.8 extconf.rb
extconf.rb:8:in `require': no such file to load -- mkmf (LoadError)
from extconf.rb:8

Gem files will remain installed in /usr/lib/ruby/gems/1.8/gems/fastthread-1.0.7 for inspection.
Results logged to /usr/lib/ruby/gems/1.8/gems/fastthread-1.0.7/ext/fastthread/gem_make.out

What’s happening? What did I do wrong?

According to a blog post by Al Hoang, a Ruby dev package needed to be installed. Well, I wouldn’t have a clue about this!

So, to FIX this, I need to install ruby1.8-dev:

$ sudo apt-get install ruby1.8-dev

Now, I’m ready to install Passenger gem:

$ sudo gem install passenger
Building native extensions. This could take a while...
Successfully installed passenger-2.2.4
1 gem installed
Installing ri documentation for passenger-2.2.4...
Installing RDoc documentation for passenger-2.2.4...

Credit: Fixing ‘mkmf’ load error Ruby in Ubuntu