MySQL setup error

log.txt

 Package configuration
 ──────────────────────────────────────────────────────────────────────────────

┌───────────────────────Configuring mysql-server-5.5─────────────────────────┐
│ Unable to set password for the MySQL "root" user                           │
│                                                                            │
│ An error occurred while setting the password for the MySQL                 │
│ administrative user. This may have happened because the account already    │
│ has a password, or because of a communication problem with the MySQL       │
│ server.                                                                    │
│                                                                            │
│ You should check the account's password after the package installation.    │
│                                                                            │
│ Please read the /usr/share/doc/mysql-server-5.5/README.Debian file for     │
│ more information.                                                          │
│                                                                            │
│                                                                            │
├────────────────────────────────────────────────────────────────────────────┤
│                                 <  OK  >                                   │
└────────────────────────────────────────────────────────────────────────────┘
  


[....] Starting MySQL database server: mysqld . . . . . . . . . . . . . . . . . [FAIL . . . . . . . . . . failed!
invoke-rc.d: initscript mysql, action "start" failed.
dpkg: error processing package mysql-server-5.5 (--configure):
 subprocess installed post-installation script returned error exit status 1
Setting up mysql-client (5.5.52-0+deb8u1) ...
dpkg: dependency problems prevent configuration of mysql-server:
 mysql-server depends on mysql-server-5.5; however:
  Package mysql-server-5.5 is not configured yet.

dpkg: error processing package mysql-server (--configure):
 dependency problems - leaving unconfigured
Processing triggers for libc-bin (2.19-18+deb8u6) ...
Processing triggers for systemd (215-17+deb8u5) ...
Errors were encountered while processing:
 mysql-server-5.5
 mysql-server
E: Sub-process /usr/bin/dpkg returned an error code (1)
Failed to perform requested operation on package.  Trying to recover:
Setting up mysql-server-5.5 (5.5.52-0+deb8u1) ...
[ ok ] Stopping MySQL database server: mysqld.
[....] Starting MySQL database server: mysqld . . . . . . . . . . . . . . . . . [FAIL . . . . . . . . . . failed!