Comment 21 for bug 444349

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Vyacheslav S. (svm) wrote : Re: package mysql-server-5.1 5.1.37-1ubuntu4 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

>Is there a /etc/mysql/debian.cnf file on the system?
Yes

I solved the problem this way:
reinstalled mysql-server-5.1 and deleted old mysql-server packages.

Apparently today updating the mysql-server-5.1 poorly installed.