Hello turrailes, thank you for taking the time to file this bug report
and help us make Ubuntu better!

The error messages indicating the failures in stopping mysqld seem
somewhat inconsistent and confusing.

The first one, while trying to upgrade from 5.1.41-3ubuntu12.3 to
5.1.41-3ubuntu12.6 is here:

S'està preparant per a reemplaçar mysql-server-5.1 5.1.41-3ubuntu12.3
(fent servir .../mysql-server-5.1_5.1.41-3ubuntu12.6_i386.deb) ...

^X^^Vv     stop: Job has already been stopped: mysql
invoke-rc.d: initscript mysql, action "stop" failed.
invoke-rc.d returned 1
There is a MySQL server running, but we failed in our attempts to stop it.
Stop it yourself and try again!
dpkg: s'ha produït un error en processar 
/var/cache/apt/archives/mysql-server-5.1_5.1.41-3ubuntu12.6_i386.deb (--unpack):
 el subprocés seqüència pre-installation nova retornà el codi d'eixida d'error 1

I think this may happen because of an unfortunate race condition in
/lib/init/upstart-job that checks status, and if it has a pid, tries to
stop it, but it may die (for some other reason, such a it was already in
a stopping state) between this check. So, in this way, it should be
possible to repeat the upgrade attempt and have it not fail every time.

S'està preparant per a reemplaçar mysql-server-5.1 5.1.41-3ubuntu12.3 (fent 
servir .../mysql-server-5.1_5.1.41-3ubuntu12.3_i386.deb) ...
Terminated
invoke-rc.d: initscript mysql, action "stop" failed.
invoke-rc.d returned 143
There is a MySQL server running, but we failed in our attempts to stop it.
Stop it yourself and try again!
dpkg: s'ha produït un error en processar 
/var/cache/apt/archives/mysql-server-5.1_5.1.41-3ubuntu12.3_i386.deb (--unpack):
 el subprocés seqüència pre-installation nova retornà el codi d'eixida d'error 1

This actually supports the same theory, as I believe the 'kill timeout
300' was not present in 5.1.41-3ubuntu12.3, so upstart would kill mysqld
after 5 seconds.. which would explain the 'Terminated' error.

Can you try stopping mysql before doing your install/upgrades?

stop mysql

should do it. Please report back on the results of trying that, as I
think this is probably reproducible if mysqld takes a long time to stop.

Marking Incomplete pending response from turrailes.

** Changed in: mysql-dfsg-5.1 (Ubuntu)
       Status: New => Incomplete

-- 
package mysql-server-5.1 5.1.41-3ubuntu12.3 failed to install/upgrade: el 
subprocés seqüència pre-installation nova retornà el codi d'eixida d'error 1
https://bugs.launchpad.net/bugs/677181
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