[Bug 835715] Re: package mysql-server-5.1 5.1.54-1ubuntu4 failed to install/upgrade: subprocess installed post-installation script returned error exit status 100

[Roberto Maurizzi]

I had the same problem and I'd say the real bug here is that on upgrade the file /etc/apparmor.d/usr.sbin.mysqld was not updated to allow access to /run/mysql.[pid|sock]
Reinstalling the mysql package simply replaced the old mysql apparmor profile with the new one that contains the correct path.

btw,  ntp has the same problem.

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Title:
  package mysql-server-5.1 5.1.54-1ubuntu4 failed to install/upgrade:
  subprocess installed post-installation script returned error exit
  status 100

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