MySQL upgrade (5.5 to 5.7) I upgraded my MySQL version from 5.5 to 5.7 and in phpmyadmin I get this error message. I tried to reinstall and reconfigure it but I have still this problem. Can you help me? I am using Linux Mint. Thank you
It takes two steps.  You must upgrade from 5.5 to 5.6 and run mysql_upgrade, then do 5.6 to 5.7.