To help others who may run into a problem:
The problem was that the /etc/mysql/my.cnf file was writable by a user other than "root". Therefore, during the mysql installation, the file was ignored and the installation did not work.
Simple:
chmod 644 /etc/mysql/my.cnf aptitude remove mysql-server aptitude install mysql-server aptitude install mysql-common
Is the work well done.
Aptitude, in my opinion, is much better than apt-get. It manages dependencies much better than the other, and you have less chance of problems.
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