1- Backup /var/lib/mysql to other location
2- Reinstalling MySQL may solve the problem, but should only be used as a last resort! To reinstall:
sudo apt purge mysql-server mysql-common
sudo apt autoremove mysql-server mysql-common
and reinstall it again
sudo apt-get update
sudo apt-get install mysql-server
3- copy backup to /var/lib/mysql
or in case it is not override old database please reverse backup
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