Hi Miguel Angel
Thank for your answer but I tried other thing. I removed all the percona package and a make a dpkg-reconfigure and apt-get install f to leave the system with the package in a correct state.
After that I tried to install again percona server and client and I get an error again in the post script installation. Looking in the mysql logs I get this:
130418 17:21:59 Percona XtraDB ([URL=“http://www.percona.com”]http://www.percona.com[/URL=“http://www.percona.com”]) 5.5.30-rel30.2 started; log sequence number 1597945
ERROR: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'ALTER TABLE user ADD column Show_view_priv enum(‘N’,‘Y’) CHARACTER SET utf8 NOT ’ at line 1
The thing is that percona is correctly installed and working but the package it is marked with half configured status, so each time i tried to make an apt-get 'something’try to install percona again.