Comment #3 fixed it for me, too.
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https://bugs.launchpad.net/bugs/1435823
Title:
Disappearing /var/run/mysqld causes mysqld to fail after reboot
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I had this issue, but it did not concern the debian-sys-maint
credentials. In my case I had defined a non-standard socket location in
my /etc/mysql/my.cnf, and the socket location in /etc/mysql/debian.cnf
was different. Therefore the server could not be stopped nor started
during upgrade.
I
