It was configuration problem. I had to reinstall `mysql-server` and
configure it again. Now there are no warnings during `sudo apt update`
and no report bug messages.
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Public bug reported:
Error mysql-server is not configured yet was thrown already during `sudo
apt update` now during system upgrade.
ProblemType: Package
DistroRelease: Ubuntu 17.10
Package: mysql-server 5.7.22-0ubuntu0.17.10.1
ProcVersionSignature: Ubuntu 4.13.0-41.46-generic 4.13.16
Uname:
