Indeed, after installing systemd on that machine and booting with init=/bin/systemd the upgrade was successful.
The error does seem to get triggerred by /etc/init.d/mysql when starting manually, the script complains somewhat cryptically about not finding the HOME dir and setting HOME=/ The daemon does start, though but I guess apt sees it as an error and thinks mysql was not started successfully. When using systemd, the init script is not used and mysql_safe is started directly using the provided systemd service file /lib/systemd/system/mysql.service It seems the upgrade path doesn't work when there is the old sysvrc init installed, so mysql-server-5.6 should either explicitly depend on systemd or the init script needs to be modified. Regards, Dominik
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