MySql ne s’est pas installé correctement et je ne peux plus utiliser le centre de logiciels ni supprimer MySql.

Lorsque j'ai ouvert le centre de logiciel, j'ai eu une erreur en disant

"Le nouveau logiciel ne peut pas être installé car il y a un problème avec le logiciel actuellement installé. Voulez-vous réparer ce problème maintenant?"

Lorsque je clique sur le bouton de réparation, une fenêtre contextuelle s'affiche pour indiquer "Echec de l'opération du package. L'installation ou la suppression d'un package logiciel a échoué".

Détails:

 installArchives() failed: Preconfiguring packages ...
    Preconfiguring packages ...
Preconfiguring packages ...
(Reading database ... 
(Reading database ... 5%
(Reading database ... 10%
(Reading database ... 15%
(Reading database ... 20%
(Reading database ... 25%
(Reading database ... 30%
(Reading database ... 35%
(Reading database ... 40%
(Reading database ... 45%
(Reading database ... 50%
(Reading database ... 55%
(Reading database ... 60%
(Reading database ... 65%
(Reading database ... 70%
(Reading database ... 75%
(Reading database ... 80%
(Reading database ... 85%
(Reading database ... 90%
(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 625805 files and directories currently installed.)
Preparing to unpack .../mysql-server-5.5_5.5.44-0ubuntu0.14.04.1_amd64.deb ...
Aborting downgrade from (at least) 5.6 to 5.5.
If are sure you want to downgrade to 5.5, remove the file
/var/lib/mysql/debian-*.flag and try installing again.
dpkg: error processing archive /var/cache/apt/archives/mysql-server-5.5_5.5.44-0ubuntu0.14.04.1_amd64.deb (--unpack):
subprocess new pre-installation script returned error exit status 1
Errors were encountered while processing:
/var/cache/apt/archives/mysql-server-5.5_5.5.44-0ubuntu0.14.04.1_amd64.deb
Error in function: 
dpkg: dependency problems prevent configuration of mysql-server:
mysql-server depends on mysql-server-5.5; however:
Package mysql-server-5.5 is not installed.

dpkg: error processing package mysql-server (--configure):
dependency problems - leaving unconfigured

J'ai ensuite essayé de supprimer complètement MySql en utilisant

sudo apt-get remove --purge mysql\*

et je reçois ce

 Reading package lists... Done
Building dependency tree       
Reading state information... Done
Note, selecting 'cvm-mysql' for regex 'mysql*'
Note, selecting 'libnss-mysql-bg' for regex 'mysql*'
Note, selecting 'mysql-utilities' for regex 'mysql*'
Note, selecting 'libmysqlclient10-dev' for regex 'mysql*'
Note, selecting 'libdbd-mysql-ruby1.9.1' for regex 'mysql*'
Note, selecting 'parser3-mysql' for regex 'mysql*'
Note, selecting 'pinba-engine-mysql-5.5' for regex 'mysql*'
Note, selecting 'tntdb-mysql4' for regex 'mysql*'
Note, selecting 'dpm-mysql' for regex 'mysql*'
Note, selecting 'mysql-workbench-data' for regex 'mysql*'
Note, selecting 'libdspam7-drv-mysql' for regex 'mysql*'
Note, selecting 'python2.4-mysqldb' for regex 'mysql*'
Note, selecting 'mysql-server-core-5.0' for regex 'mysql*'
Note, selecting 'mysql-server-core-5.1' for regex 'mysql*'
Note, selecting 'mysql-server-core-5.5' for regex 'mysql*'
Note, selecting 'mysql-server-core-5.6' for regex 'mysql*'
Note, selecting 'sbnc-mysql' for regex 'mysql*'
Note, selecting 'jabberd2-mysql' for regex 'mysql*'
Note, selecting 'mysql-server-5.0' for regex 'mysql*'
Note, selecting 'mysql-server-5.1' for regex 'mysql*'
Note, selecting 'mysql-server-5.5' for regex 'mysql*'
Note, selecting 'php4-mysql' for regex 'mysql*'
Note, selecting 'mysql-server-5.6' for regex 'mysql*'
Note, selecting 'lua5.1-dbi-mysql-dev' for regex 'mysql*'
Note, selecting 'aolserver4-nsmysql' for regex 'mysql*'
Note, selecting 'mysql-workbench-oss' for regex 'mysql*'
Note, selecting 'gambas3-gb-mysql' for regex 'mysql*'
Note, selecting 'haskell-hsql-mysql-doc' for regex 'mysql*'
Note, selecting 'courier-authlib-mysql' for regex 'mysql*'
Note, selecting 'lua5.1-sql-mysql' for regex 'mysql*'
Note, selecting 'libqt4-sql-mysql' for regex 'mysql*'
Note, selecting 'lua5.1-sql-mysql-dev' for regex 'mysql*'
Note, selecting 'libmysql-cil-dev' for regex 'mysql*'
Note, selecting 'libmysql++3' for regex 'mysql*'
Note, selecting 'akonadi-backend-mysql' for regex 'mysql*'
Note, selecting 'mysql-client-core-5.1' for regex 'mysql*'
Note, selecting 'mysql-client-core-5.5' for regex 'mysql*'
Note, selecting 'mysql-client-core-5.6' for regex 'mysql*'
Note, selecting 'pure-ftpd-mysql' for regex 'mysql*'
Note, selecting 'libcrypt-mysql-perl' for regex 'mysql*'
Note, selecting 'automysqlbackup' for regex 'mysql*'
Note, selecting 'owncloud-mysql' for regex 'mysql*'
Note, selecting 'python-mysql.connector' for regex 'mysql*'
Note, selecting 'mysqltcl' for regex 'mysql*'
Note, selecting 'bacula-sd-mysql-dbg' for regex 'mysql*'
Note, selecting 'libqt5sql5-mysql' for regex 'mysql*'
Note, selecting 'virtual-mysql-testsuite' for regex 'mysql*'
Note, selecting 'libpocomysql9-dbg' for regex 'mysql*'
Note, selecting 'yate-mysql' for regex 'mysql*'
Note, selecting 'lua-dbi-mysql-dbg' for regex 'mysql*'
Note, selecting 'dpsyco-mysql' for regex 'mysql*'
Note, selecting 'mysql-mmm-agent' for regex 'mysql*'
Note, selecting 'libmysql5.0-cil' for regex 'mysql*'
Note, selecting 'mysql-client' for regex 'mysql*'
Note, selecting 'falconpl-dbi-mysql' for regex 'mysql*'
Note, selecting 'php5-mysql' for regex 'mysql*'
Note, selecting 'mysqmail-dovecot-logger' for regex 'mysql*'
Note, selecting 'libkaya-mysql-dev' for regex 'mysql*'
Note, selecting 'postfix-cluebringer-mysql' for regex 'mysql*'
Note, selecting 'libwtdbomysql35' for regex 'mysql*'
Note, selecting 'gnash-ext-mysql' for regex 'mysql*'
Note, selecting 'gmysqlcc' for regex 'mysql*'
Note, selecting 'mysql-mmm-monitor' for regex 'mysql*'
Note, selecting 'dbf2mysql' for regex 'mysql*'
Note, selecting 'lua-dbi-mysql-dev' for regex 'mysql*'
Note, selecting 'ulogd2-mysql' for regex 'mysql*'
Note, selecting 'mysql-common-5.6' for regex 'mysql*'
Note, selecting 'voms-mysql-plugin-dbg' for regex 'mysql*'
Note, selecting 'asterisk-mysql' for regex 'mysql*'
Note, selecting 'postfix-mysql' for regex 'mysql*'
Note, selecting 'libdbd-mysql-ruby' for regex 'mysql*'
Note, selecting 'pike7.8-mysql' for regex 'mysql*'
Note, selecting 'oar-server-mysql' for regex 'mysql*'
Note, selecting 'virtual-mysql-client' for regex 'mysql*'
Note, selecting 'libmysql++-dev' for regex 'mysql*'
Note, selecting 'scilab-scimysql' for regex 'mysql*'
Note, selecting 'libmysql6.0-cil' for regex 'mysql*'
Note, selecting 'mysql-workbench-community' for regex 'mysql*'
Note, selecting 'lua5.2-sql-mysql-dev' for regex 'mysql*'
Note, selecting 'strongswan-plugin-mysql' for regex 'mysql*'
Note, selecting 'mysql-mmm-common' for regex 'mysql*'
Note, selecting 'root-plugin-io-mysql' for regex 'mysql*'
Note, selecting 'monodoc-mysql6.0-manual' for regex 'mysql*'
Note, selecting 'kamailio-mysql-modules' for regex 'mysql*'
Note, selecting 'lua-dbi-mysql' for regex 'mysql*'
Note, selecting 'tcl8.6-tdbc-mysql' for regex 'mysql*'
Note, selecting 'pdns-backend-mysql' for regex 'mysql*'
Note, selecting 'r-cran-rmysql' for regex 'mysql*'
Note, selecting 'kexi-mysql-driver' for regex 'mysql*'
Note, selecting 'libghc-hsql-mysql-dev' for regex 'mysql*'
Note, selecting 'bacula-sd-mysql' for regex 'mysql*'
Note, selecting 'libmysqlclient12-dev' for regex 'mysql*'
Note, selecting 'mysql-source-5.5' for regex 'mysql*'
Note, selecting 'mysql-source-5.6' for regex 'mysql*'
Note, selecting 'libghc-hsql-mysql-prof' for regex 'mysql*'
Note, selecting 'mha4mysql-master' for regex 'mysql*'
Note, selecting 'libghc-hsql-mysql-prof-1.8.2-e92cc' for regex 'mysql*'
Note, selecting 'libmysqlcppconn7' for regex 'mysql*'
Note, selecting 'ulogd-mysql' for regex 'mysql*'
Note, selecting 'mysql-mmm-tools' for regex 'mysql*'
Note, selecting 'dpm-copy-server-mysql' for regex 'mysql*'
Note, selecting 'php5-mysqli' for regex 'mysql*'
Note, selecting 'mysql-testsuite-5.5' for regex 'mysql*'
Note, selecting 'mysql-testsuite-5.6' for regex 'mysql*'
Note, selecting 'dpm-mysql-srmv22' for regex 'mysql*'
Note, selecting 'lua-sql-mysql' for regex 'mysql*'
Note, selecting 'python2.7-mysqldb' for regex 'mysql*'
Note, selecting 'libmysql-java' for regex 'mysql*'
Note, selecting 'handlersocket-mysql-5.1' for regex 'mysql*'
Note, selecting 'bacula-director-mysql' for regex 'mysql*'
Note, selecting 'handlersocket-mysql-5.5' for regex 'mysql*'
Note, selecting 'ruby-mysql2' for regex 'mysql*'
Note, selecting 'zabbix-proxy-mysql' for regex 'mysql*'
Note, selecting 'libmysql++-doc' for regex 'mysql*'
Note, selecting 'root-plugin-sql-mysql' for regex 'mysql*'
Note, selecting 'mysqltuner' for regex 'mysql*'
Note, selecting 'libmysqlcppconn-dev' for regex 'mysql*'
Note, selecting 'mysql-proxy' for regex 'mysql*'
Note, selecting 'libdbd-mysql-ruby1.8' for regex 'mysql*'
Note, selecting 'mha4mysql-node' for regex 'mysql*'
Note, selecting 'puppet-module-puppetlabs-mysql' for regex 'mysql*'
Note, selecting 'mysql-client-5.0' for regex 'mysql*'
Note, selecting 'mysql-client-5.1' for regex 'mysql*'
Note, selecting 'mysql-client-5.5' for regex 'mysql*'
Note, selecting 'mysql-client-5.6' for regex 'mysql*'
Note, selecting 'proftpd-mod-mysql' for regex 'mysql*'
Note, selecting 'mysql-workbench' for regex 'mysql*'
Note, selecting 'libghc-hsql-mysql-doc' for regex 'mysql*'
Note, selecting 'cl-sql-mysql' for regex 'mysql*'
Note, selecting 'lfc-mysql' for regex 'mysql*'
Note, selecting 'libaprutil1-dbd-mysql' for regex 'mysql*'
Note, selecting 'voms-mysql-plugin' for regex 'mysql*'
Note, selecting 'rsyslog-mysql' for regex 'mysql*'
Note, selecting 'oar-user-mysql' for regex 'mysql*'
Note, selecting 'dovecot-mysql' for regex 'mysql*'
Note, selecting 'lua-sql-mysql-dev' for regex 'mysql*'
Note, selecting 'mysqmail-postfix-logger' for regex 'mysql*'
Note, selecting 'libapache2-mod-log-sql-mysql' for regex 'mysql*'
Note, selecting 'php5-mysqlnd-ms' for regex 'mysql*'
Note, selecting 'mysql-workbench-gpl' for regex 'mysql*'
Note, selecting 'bacula-common-mysql' for regex 'mysql*'
Note, selecting 'courier-authmysql' for regex 'mysql*'
Note, selecting 'virtual-mysql-client-core' for regex 'mysql*'
Note, selecting 'python2.3-mysqldb' for regex 'mysql*'
Note, selecting 'libwtdbomysql-dev' for regex 'mysql*'
Note, selecting 'virtual-mysql-server-core' for regex 'mysql*'
Note, selecting 'perdition-mysql' for regex 'mysql*'
Note, selecting 'mysql-common' for regex 'mysql*'
Note, selecting 'bacula-common-mysql-dbg' for regex 'mysql*'
Note, selecting 'tarantool-mysql-plugin' for regex 'mysql*'
Note, selecting 'libnss-mysql' for regex 'mysql*'
Note, selecting 'libmysqld-pic' for regex 'mysql*'
Note, selecting 'dpm-mysql-srmv1' for regex 'mysql*'
Note, selecting 'dpm-mysql-srmv2' for regex 'mysql*'
Note, selecting 'nuauth-log-mysql' for regex 'mysql*'
Note, selecting 'mysqmail-courier-logger' for regex 'mysql*'
Note, selecting 'roundcube-mysql' for regex 'mysql*'
Note, selecting 'ruby-dbd-mysql' for regex 'mysql*'
Note, selecting 'gnokii-smsd-mysql' for regex 'mysql*'
Note, selecting 'libclass-dbi-mysql-perl' for regex 'mysql*'
Note, selecting 'pennmush-mysql' for regex 'mysql*'
Note, selecting 'freeradius-mysql' for regex 'mysql*'
Note, selecting 'libpam-mysql' for regex 'mysql*'
Note, selecting 'libmysqlclient18' for regex 'mysql*'
Note, selecting 'libmysqlclient14-dev' for regex 'mysql*'
Note, selecting 'librdf-storage-mysql' for regex 'mysql*'
Note, selecting 'ruby-mysql' for regex 'mysql*'
Note, selecting 'snort-mysql' for regex 'mysql*'
Note, selecting 'spl-mysql' for regex 'mysql*'
Note, selecting 'libdbd-mysql' for regex 'mysql*'
Note, selecting 'node-mysql' for regex 'mysql*'
Note, selecting 'mysql-testsuite' for regex 'mysql*'
Note, selecting 'libmysqlclient-dev' for regex 'mysql*'
Note, selecting 'libghc-hsql-mysql-dev-1.8.2-e92cc' for regex 'mysql*'
Note, selecting 'bacula-director-mysql-dbg' for regex 'mysql*'
Note, selecting 'dpm-srm-server-mysql' for regex 'mysql*'
Note, selecting 'php5-mysqlnd' for regex 'mysql*'
Note, selecting 'libopendbx1-mysql' for regex 'mysql*'
Note, selecting 'python-mysqldb' for regex 'mysql*'
Note, selecting 'libreoffice-mysql-connector' for regex 'mysql*'
Note, selecting 'libgda-5.0-mysql' for regex 'mysql*'
Note, selecting 'zabbix-server-mysql' for regex 'mysql*'
Note, selecting 'opendnssec-dbg-mysql' for regex 'mysql*'
Note, selecting 'libdatetime-format-mysql-perl' for regex 'mysql*'
Note, selecting 'libghc6-hsql-mysql-doc' for regex 'mysql*'
Note, selecting 'libapache2-mod-auth-mysql' for regex 'mysql*'
Note, selecting 'libmysql-ocaml-dev' for regex 'mysql*'
Note, selecting 'libtime-piece-mysql-perl' for regex 'mysql*'
Note, selecting 'dpm-mysql-copyd' for regex 'mysql*'
Note, selecting 'monodoc-mysql5.0-manual' for regex 'mysql*'
Note, selecting 'dsyslog-module-mysql' for regex 'mysql*'
Note, selecting 'libmysql-ocaml-dev-ddr32' for regex 'mysql*'
Note, selecting 'monodoc-mysql-manual' for regex 'mysql*'
Note, selecting 'mha4mysql-manager' for regex 'mysql*'
Note, selecting 'gsql-mysql-engine' for regex 'mysql*'
Note, selecting 'rt4-db-mysql' for regex 'mysql*'
Note, selecting 'libmysql-ocaml-ddr32' for regex 'mysql*'
Note, selecting 'lighttpd-mod-mysql-vhost' for regex 'mysql*'
Note, selecting 'libmysqlclient15-dev' for regex 'mysql*'
Note, selecting 'mysql-server' for regex 'mysql*'
Note, selecting 'opensips-mysql-module' for regex 'mysql*'
Note, selecting 'ndoutils-nagios2-mysql' for regex 'mysql*'
Note, selecting 'mysql-server-core' for regex 'mysql*'
Note, selecting 'lfc-server-mysql' for regex 'mysql*'
Note, selecting 'ratbox-services-mysql' for regex 'mysql*'
Note, selecting 'mysqmail' for regex 'mysql*'
Note, selecting 'ndoutils-mysql' for regex 'mysql*'
Note, selecting 'python-mysqldb-dbg' for regex 'mysql*'
Note, selecting 'libmysql-ocaml' for regex 'mysql*'
Note, selecting 'mysqmail-pure-ftpd-logger' for regex 'mysql*'
Note, selecting 'jabberd2-ldap-mysql' for regex 'mysql*'
Note, selecting 'dpm-mysql-nameserver' for regex 'mysql*'
Note, selecting 'gambas3-gb-db-mysql' for regex 'mysql*'
Note, selecting 'python3-mysql.connector' for regex 'mysql*'
Note, selecting 'libmysql6.4-cil' for regex 'mysql*'
Note, selecting 'libmysqld-dev' for regex 'mysql*'
Note, selecting 'libdbd-mysql-perl' for regex 'mysql*'
Note, selecting 'virtual-mysql-server' for regex 'mysql*'
Note, selecting 'dpm-name-server-mysql' for regex 'mysql*'
Note, selecting 'libmysql-diff-perl' for regex 'mysql*'
Note, selecting 'dpm-server-mysql' for regex 'mysql*'
Note, selecting 'lua5.2-sql-mysql' for regex 'mysql*'
Note, selecting 'lua5.1-dbi-mysql' for regex 'mysql*'
Note, selecting 'ndoutils-nagios3-mysql' for regex 'mysql*'
Note, selecting 'php-mdb2-driver-mysql' for regex 'mysql*'
Note, selecting 'libpocomysql9' for regex 'mysql*'
Note, selecting 'redmine-mysql' for regex 'mysql*'
Note, selecting 'opendnssec-enforcer-mysql' for regex 'mysql*'
Note, selecting 'ruby-dataobjects-mysql' for regex 'mysql*'
Package 'libmysqlclient10-dev' is not installed, so not removed
Package 'libmysqlclient12-dev' is not installed, so not removed
Package 'libmysqlclient14-dev' is not installed, so not removed
Note, selecting 'libmysqlclient-dev' instead of 'libmysqlclient15-dev'
Package 'mysql-client-5.0' is not installed, so not removed
Package 'mysql-client-5.1' is not installed, so not removed
Package 'mysql-client-core-5.1' is not installed, so not removed
Package 'mysql-server-5.1' is not installed, so not removed
Package 'mysql-server-core-5.1' is not installed, so not removed
Package 'mysql-server-5.0' is not installed, so not removed
Package 'mysql-server-core-5.0' is not installed, so not removed
Note, selecting 'mysql-server-core-5.5' instead of 'mysql-server-core'
Package 'php5-mysqli' is not installed, so not removed
Package 'python2.3-mysqldb' is not installed, so not removed
Package 'python2.4-mysqldb' is not installed, so not removed
Note, selecting 'python-mysqldb' instead of 'python2.7-mysqldb'
Package 'courier-authmysql' is not installed, so not removed
Note, selecting 'dpm-copy-server-mysql' instead of 'dpm-mysql-copyd'
Note, selecting 'dpm-name-server-mysql' instead of 'dpm-mysql-nameserver'
Note, selecting 'dpm-server-mysql' instead of 'dpm-mysql'
Note, selecting 'dpm-srm-server-mysql' instead of 'dpm-mysql-srmv1'
Note, selecting 'dpm-srm-server-mysql' instead of 'dpm-mysql-srmv2'
Note, selecting 'dpm-srm-server-mysql' instead of 'dpm-mysql-srmv22'
Package 'libqt4-sql-mysql' is not installed, so not removed. Did you mean 'libqt4-sql-mysql:i386'?
Package 'mysql-client' is not installed, so not removed
Package 'mysql-server-5.5' is not installed, so not removed
Package 'postfix-mysql' is not installed, so not removed
Package 'strongswan-plugin-mysql' is not installed, so not removed
Package 'akonadi-backend-mysql' is not installed, so not removed
Package 'dovecot-mysql' is not installed, so not removed
Package 'libmysqld-pic' is not installed, so not removed
Package 'libqt5sql5-mysql' is not installed, so not removed
Package 'libreoffice-mysql-connector' is not installed, so not removed
Package 'mysql-source-5.5' is not installed, so not removed
Package 'mysql-testsuite' is not installed, so not removed
Package 'mysql-testsuite-5.5' is not installed, so not removed
Package 'php5-mysqlnd' is not installed, so not removed
Package 'rsyslog-mysql' is not installed, so not removed
Package 'pdns-backend-mysql' is not installed, so not removed
Package 'mysql-client-5.6' is not installed, so not removed
Package 'mysql-client-core-5.6' is not installed, so not removed
Package 'mysql-server-core-5.6' is not installed, so not removed
Package 'mysql-source-5.6' is not installed, so not removed
Package 'mysql-testsuite-5.6' is not installed, so not removed
Package 'opensips-mysql-module' is not installed, so not removed
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies.
 libmysqlclient18:i386 : Depends: mysql-common:i386 (>= 5.5.44-0ubuntu0.14.04.1)
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

Après apt-get -f installje reçois:

Preconfiguring packages ... 
(Reading database ... 625805 files and directories currently installed.) 
Preparing to unpack .../mysql-server-5.5_5.5.44-0ubuntu0.14.04.1_amd64.deb ... 
Aborting downgrade from (at least) 5.6 to 5.5. If are sure you want to downgrade to 5.5, remove the file /var/lib/mysql/debian-*.flag and try installing again.
dpkg: error processing archive /var/cache/apt/archives/mysql-server-5.5_5.5.44-0ubuntu0.14.04.1_amd64.deb (--unpack): subprocess new pre-installation script returned error exit status 1 
Errors were encountered while processing: /var/cache/apt/archives/mysql-server-5.5_5.5.44-0ubuntu0.14.04.1_amd64.deb 
E: Sub-process /usr/bin/dpkg returned an error code (1)

Pour supprimer le fichier, utilisez par exemple: sudo rm -rf /var/lib/mysql/debian-*.flag

Pour voir quels drapeaux existent: sudo ls -al /var/lib/mysql/debian-*

Essaye ça

sudo apt-get clean 
sudo apt-get update 
sudo apt-get install -f 
sudo dpkg-recofigure -a

Si vous êtes certain de vouloir passer à la version 5.5, supprimez le fichier /var/lib/mysql/debian-*.flag et essayez à nouveau d’installer.