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Impossible d'installer mysql-server (5.5.22) sur un serveur propre ubuntu 12.04 LTS

J'ai une installation minimale propre du serveur Ubuntu 12.04 LTS 64 bits (juste un utilisateur root et rien d’autre n’est installé). J'ai essayé d'installer le serveur mysql avec la commande suivante:

apt-get install mysql-server

L'installation est abandonnée avec l'erreur suivante:

The following NEW packages will be installed:
  libdbd-mysql-Perl{a} libmysqlclient18{a} mysql-client mysql-client-5.5{a}
  mysql-client-core-5.5{a} mysql-common{a} mysql-server mysql-server-5.5{a}
  mysql-server-core-5.5{a}
0 packages upgraded, 9 newly installed, 0 to remove and 0 not upgraded.
Need to get 11.7 kB/26.2 MB of archives. After unpacking 94.5 MB will be used.
Do you want to continue? [Y/n/?] y
Get: 1 http://mirror.eu.oneandone.net/ubuntu/ubuntu/ precise/main mysql-client all 5.5.22-0ubuntu1 [11.7 kB]
Fetched 11.7 kB in 0s (567 kB/s)
Preconfiguring packages ...
Selecting previously unselected package mysql-common.
(Reading database ... 54008 files and directories currently installed.)
Unpacking mysql-common (from .../mysql-common_5.5.22-0ubuntu1_all.deb) ...
Selecting previously unselected package libmysqlclient18.
Unpacking libmysqlclient18 (from .../libmysqlclient18_5.5.22-0ubuntu1_AMD64.deb) ...
Selecting previously unselected package libdbd-mysql-Perl.
Unpacking libdbd-mysql-Perl (from .../libdbd-mysql-Perl_4.020-1build2_AMD64.deb) ...
Selecting previously unselected package mysql-client-core-5.5.
Unpacking mysql-client-core-5.5 (from .../mysql-client-core-5.5_5.5.22-0ubuntu1_AMD64.deb) ...
Selecting previously unselected package mysql-client-5.5.
Unpacking mysql-client-5.5 (from .../mysql-client-5.5_5.5.22-0ubuntu1_AMD64.deb) ...
Selecting previously unselected package mysql-server-core-5.5.
Unpacking mysql-server-core-5.5 (from .../mysql-server-core-5.5_5.5.22-0ubuntu1_AMD64.deb) ...
Processing triggers for man-db ...
Setting up mysql-common (5.5.22-0ubuntu1) ...
Selecting previously unselected package mysql-server-5.5.
(Reading database ... 54189 files and directories currently installed.)
Unpacking mysql-server-5.5 (from .../mysql-server-5.5_5.5.22-0ubuntu1_AMD64.deb) ...
Selecting previously unselected package mysql-client.
Unpacking mysql-client (from .../mysql-client_5.5.22-0ubuntu1_all.deb) ...
Selecting previously unselected package mysql-server.
Unpacking mysql-server (from .../mysql-server_5.5.22-0ubuntu1_all.deb) ...
Processing triggers for ureadahead ...
Processing triggers for man-db ...
Setting up libmysqlclient18 (5.5.22-0ubuntu1) ...
Setting up libdbd-mysql-Perl (4.020-1build2) ...
Setting up mysql-client-core-5.5 (5.5.22-0ubuntu1) ...
Setting up mysql-client-5.5 (5.5.22-0ubuntu1) ...
Setting up mysql-server-core-5.5 (5.5.22-0ubuntu1) ...
Setting up mysql-server-5.5 (5.5.22-0ubuntu1) ...
120502 10:17:41 [Note] Plugin 'FEDERATED' is disabled.
120502 10:17:41 InnoDB: The InnoDB memory heap is disabled
120502 10:17:41 InnoDB: Mutexes and rw_locks use GCC atomic builtins
120502 10:17:41 InnoDB: Compressed tables use zlib 1.2.3.4
120502 10:17:41 InnoDB: Initializing buffer pool, size = 128.0M
120502 10:17:41 InnoDB: Completed initialization of buffer pool
120502 10:17:41 InnoDB: highest supported file format is Barracuda.
120502 10:17:41  InnoDB: Waiting for the background threads to start
120502 10:17:42 InnoDB: 1.1.8 started; log sequence number 1595675
120502 10:17:42  InnoDB: Starting shutdown...
120502 10:17:42  InnoDB: Shutdown completed; log sequence number 1595675
start: Job failed to start
invoke-rc.d: initscript mysql, action "start" failed.
dpkg: error processing mysql-server-5.5 (--configure):
 subprocess installed post-installation script returned error exit status 1
No apport report written because MaxReports is reached already
                                                              Setting up mysql-client (5.5.22-0ubuntu1) ...
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 mysql-server (--configure):
 dependency problems - leaving unconfigured
No apport report written because MaxReports is reached already
                                                              Processing triggers for libc-bin ...
ldconfig deferred processing now taking place
Errors were encountered while processing:
 mysql-server-5.5
 mysql-server
E: Sub-process /usr/bin/dpkg returned an error code (1)
A package failed to install.  Trying to recover:
Setting up mysql-server-5.5 (5.5.22-0ubuntu1) ...
start: Job failed to start
invoke-rc.d: initscript mysql, action "start" failed.
dpkg: error processing mysql-server-5.5 (--configure):
 subprocess installed post-installation script returned error exit status 1
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 mysql-server (--configure):
 dependency problems - leaving unconfigured
Errors were encountered while processing:
 mysql-server-5.5
 mysql-server

Je suis complètement perdu parce que j'ai tout essayé sur le Web pour résoudre mon problème (effacement de l'installation, reconfiguration avec dpkg, édition manuelle du fichier my.cnf). J'ai également mis en place une nouvelle installation propre mais rien n'a aidé. Qu'est-ce que je fais mal?

Nouvelle information: le fichier /var/log/upstart/mysql.log contient l'erreur suivante après l'installation:

AppArmor parser error for /etc/apparmor.d/usr.sbin.mysqld in /etc/apparmor.d/tunables/global at line 17: Could not open 'tunables/proc'
5
Christian
6
Miguel