[Bug 1500428] Re: package mysql-server-5.6 (not installed) failed to install/upgrade: le sous-processus nouveau script pre-installation a retourné une erreur de sortie d'état 1

[Jean Claveau]

Actually I found the way to fix it :
+ I had to remove whatever (sorry i don't remember) lock file in /var/...
+ force apt-get install
+ Launch mysql in safe mode
+ remove the plugins defined in the user table
+ restart mysql

The last steps are here :
 https://zhxq.io/how-to-solve-mariadb-plugin-unix_socket-is-not-loaded-problem-after-upgrade-to-ubuntu-15-04/

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Title:
  package mysql-server-5.6 (not installed) failed to install/upgrade: le
  sous-processus nouveau script pre-installation a retourné une erreur
  de sortie d'état 1

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