package mysql-common 5.7.15-0ubuntu0.16.04.1 failed to install/upgrade: le sous-processus script post-installation installé a retourné une erreur de sortie d'état 2

[patrick]

a chaq fois que je me log j'ai eu ce message

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: mysql-common 5.7.15-0ubuntu0.16.04.1
ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16
Uname: Linux 4.4.0-36-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
AptOrdering:
 mysql-common: Install
 mysql-common: Configure
 NULL: ConfigurePending
Architecture: amd64
Date: Fri Sep 16 11:16:25 2016
Dependencies:

ErrorMessage: le sous-processus script post-installation installé a retourné une erreur de sortie d'état 2
InstallationDate: Installed on 2014-04-12 (888 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
Logs.var.log.daemon.log:

MySQLConf.etc.mysql.mysql.conf.d.mysqld_safe_syslog.cnf:
 [mysqld_safe]
 syslog
MySQLVarLibDirListing: ['ibdata1', 'ibtmp1', 'sys', 'db_perfmeasures', 'ib_logfile1', 'ib_logfile0', 'debian-5.7.flag', 'db_gfx', 'performance_schema', 'auto.cnf', 'mysql', 'ib_buffer_pool']
PackageArchitecture: all
ProcCmdline: BOOT_IMAGE=/boot/vmlinuz-4.4.0-36-generic root=UUID=2a772e66-0773-43e1-acbd-07225c99c75f ro quiet splash vt.handoff=7
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt 1.2.12~ubuntu16.04.1
SourcePackage: mysql-5.7
Title: package mysql-common 5.7.15-0ubuntu0.16.04.1 failed to install/upgrade: le sous-processus script post-installation installé a retourné une erreur de sortie d'état 2
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.mysql.conf.d.mysql.cnf: [deleted]
modified.conffile..etc.mysql.conf.d.mysqldump.cnf: [deleted]
modified.conffile..etc.mysql.my.cnf.fallback:

mtime.conffile..etc.mysql.my.cnf.fallback: 2016-09-16T11:19:58.545702