I ran into this bug today. For me this is really a grave bug as is completely broke my mail setup.
I found two ways how I could work around this bug: (A) install mysql-server and purge it again. (B) execute the following commands as root: # mkdir -m700 /var/lib/mysql-files # chown mysql:mysql /var/lib/mysql-files purging mysql-server leaves this directory existent, this is why (A) also worked. Probably the /var/lib/mysql-files directory should be created by some other package or the dependencies my need to be adjusted. Thanks, Maxi
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