package:mysql-server-5.7:5.7.23-0ubuntu0.16.04.1
Setting up mysql-server-5.7 (5.7.23-0ubuntu0.16.04.1) ...
insserv: warning: script 'S03cinder-setup-backing-file' missing LSB tags and overrides
insserv: warning: current start runlevel(s) (empty) of script `mysql' overrides LSB defaults (2 3 4 5).
insserv: warning: current stop runlevel(s) (0 1 2 3 4 5 6) of script `mysql' overrides LSB defaults (0 1 6).
insserv: warning: script 'cinder-setup-backing-file' missing LSB tags and overrides
mysql_upgrade: Got error: 2002: Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) while connecting to the MySQL server
Upgrade process encountered error and will not continue.
mysql_upgrade failed with exit status 11
dpkg: error processing package mysql-server-5.7 (--configure):
 subprocess installed post-installation script returned error exit status 1