Just to let these bugs now the progress that I made today on this issue. These bugs are not the same, but I believe they all originate from the same root cause.
Basically, I found out that dbconfig-common (dbc) always connects to the mysql database with admin privileges (see _dbc_generate_mycnf in internal/mysql). I believe this is unnecessary, as the admin privileges are only needed (as far as I can tell) to create (or remove during uninstall/purge) the database and user. After that, all the operations that dbc performs (including backups I think) can be done with the unprivileged user that is created for the package. In order to achieve this the logic of dbc needs to be adjusted, as the functions that execute the calls, don't know if they need privileged rights or not. As the current maintainer of dbc is not actively working on this package, I will try to come up with a proper solution and provide a patch for this administrator rights problem, which should solve these bugs. Paul
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