Comment 0 for bug 1435709

After upgrade to mysql-server-5.6 mysql.service fail to start (after reboot).
Here the systemctl status mysql.service:

● mysql.service - MySQL Community Server
   Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)
   Active: activating (start-post) since mar 2015-03-24 08:41:00 CET; 25s ago
  Process: 951 ExecStart=/usr/bin/mysqld_safe (code=exited, status=0/SUCCESS)
  Process: 943 ExecStartPre=/usr/share/mysql/mysql-systemd-start pre (code=exited, status=0/SUCCESS)
 Main PID: 951 (code=exited, status=0/SUCCESS); : 952 (mysql-systemd-s)
   CGroup: /system.slice/mysql.service
           └─control
             ├─ 952 /bin/bash /usr/share/mysql/mysql-systemd-start post
             └─2601 sleep 1

mar 24 08:41:00 luca-k53sd systemd[1]: Starting MySQL Community Server...
mar 24 08:41:00 luca-k53sd mysqld_safe[951]: 150324 08:41:00 mysqld_safe Can't log to error log and syslog at the same time. Remove all --log-err...e effect.
mar 24 08:41:00 luca-k53sd mysqld_safe[951]: 150324 08:41:00 mysqld_safe Logging to '/var/log/mysql/error.log'.
mar 24 08:41:00 luca-k53sd mysqld_safe[951]: mkdir: impossibile creare la directory "/var/run/mysqld": Permesso negato
mar 24 08:41:00 luca-k53sd mysqld_safe[951]: chown: impossibile accedere a "/var/run/mysqld": File o directory non esistente
mar 24 08:41:00 luca-k53sd mysqld_safe[951]: chmod: impossibile accedere a "/var/run/mysqld": File o directory non esistente
mar 24 08:41:00 luca-k53sd mysqld_safe[951]: 150324 08:41:00 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
Hint: Some lines were ellipsized, use -l to show in full.
ldisanto@luca-k53sd:~$ sudo systemctl reload mysql.service
Failed to reload mysql.service: Job type reload is not applicable for unit mysql.service.
ldisanto@luca-k53sd:~$ sudo systemctl start mysql.service
^Cldisanto@luca-k53sd:~$ ubuntu-bug
ldisanto@luca-k53sd:~$ ubuntu-bug mysql-server
QCoreApplication::postEvent: Unexpected null receiver

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: mysql-server 5.6.23-1~exp1~ubuntu4
ProcVersionSignature: Ubuntu 3.19.0-10.10-generic 3.19.2
Uname: Linux 3.19.0-10-generic x86_64
ApportVersion: 2.16.2-0ubuntu4
Architecture: amd64
CurrentDesktop: KDE
Date: Tue Mar 24 09:00:40 2015
InstallationDate: Installed on 2015-03-18 (5 days ago)
InstallationMedia: Kubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20150318)
PackageArchitecture: all
SourcePackage: mysql-5.6
UpgradeStatus: No upgrade log present (probably fresh install)