root@web1:~/MYSQL# apt-get -y dist-upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
4 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Setting up mysql-server-5.7 (5.7.19-0ubuntu0.16.04.1) ...
update-alternatives: warning: forcing reinstallation of alternative /etc/mysql/mysql.cnf because link group my.cnf is broken
update-alternatives: warning: not replacing /etc/mysql/my.cnf with a link
insserv: warning: current start runlevel(s) (2) of script `mysql' overrides LSB defaults (2 3 4 5).
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
No apport report written because the error message indicates its a followup error from a previous failure.
                                                                                                          dpkg: dependency problems prevent configuration of mysql-server:
 mysql-server depends on mysql-server-5.7; however:
  Package mysql-server-5.7 is not configured yet.

dpkg: error processing package mysql-server (--configure):
 dependency problems - leaving unconfigured
dpkg: dependency problems prevent configuration of mysql-testsuite-5.7:
 mysql-testsuite-5.7 depends on mysql-server-5.7 (= 5.7.19-0ubuntu0.16.04.1); however:
  Package mysql-server-5.7 is not configured yet.

dpkg: error processing package mysql-testsuite-5.7 (--configure):
 dependency problems - leaving unconfigured
dpkg: dependency problems prevent configuration of mysql-testsuite:
 mysql-testsuite depends on mysql-testsuite-5.7; however:
  Package mysql-testsuite-5.7 is not configured yet.

dpkg: error processing package mysql-testsuite (--configure):
 dependency problems - leaving unconfigured
No apport report written because the error message indicates its a followup error from a previous failure.
                                                                                                          No apport report written because MaxReports is reached already
                   Errors were encountered while processing:
 mysql-server-5.7
 mysql-server
 mysql-testsuite-5.7
 mysql-testsuite
E: Sub-process /usr/bin/dpkg returned an error code (1)