Comment 12 for bug 444349

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Night Eagle (nighteagle) 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

I added the following line to /etc/apparmor.d/usr.sbin.mysqld:

 /sys/devices/system/cpu/ r,

then reloaded apparmor profile and that fixed the problem for me.