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
--
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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