ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) [ERROR] [MY-010187] [Server] Could not open file '/var/log/mysql/error.log' for error logging: Permission denied

    sudo rm /var/log/mysqld.log
    systemctl reload apparmor
    touch /var/log/mysqld.log
    chown mysql:mysql /var/log/mysqld.log
    chmod 0644 /var/log/mysqld.log
    systemctl restart mysql