MySQL and MariaDB with unmet dependencies

I could not uninstalled mysql-server because there are unmet dependencies after uninstalling MariaDB...

So I tried all possible combinations with apt-get and dpkg to forcefully remove the remains of MySQL and MariaDB... Finally, unfortunately I also manually deleted all files in the directory tree, which contained anything in the name from MySQL or MariaDB...

$ sudo dpkg --audit
The following packages have been unpacked but not yet configured.
They must be configured using dpkg --configure or the configure
menu option in dselect for them to work:
 mysql-server         MySQL Server meta package depending on latest version

The following packages are missing the list control file in the
database, they need to be reinstalled:
 mariadb-client       MariaDB database client (metapackage depending on the lat
 mariadb-server-10.0  MariaDB database server binaries
 mariadb-server-core-10.0 MariaDB database core server files

The following packages are missing the md5sums control file in the
database, they need to be reinstalled:
 mariadb-client       MariaDB database client (metapackage depending on the lat
 mariadb-server-10.0  MariaDB database server binaries
 mariadb-server-core-10.0 MariaDB database core server files

But I still can not re-install MySQL because the dependencies associated with MariaDB are missing and vice versa...

$ sudo apt-get install mysql-server
Reading package lists... Done
Building dependency tree       
Reading state information... Done
mysql-server is already the newest version (5.7.22-1ubuntu16.04).
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
 mariadb-client : Depends: mariadb-client-10.0 (>= 10.0.34-0ubuntu0.16.04.1) but it is not going to be installed
 mariadb-server-10.0 : PreDepends: mariadb-common (>= 10.0.34-0ubuntu0.16.04.1) but it is not going to be installed
                       Depends: mariadb-client-10.0 (>= 10.0.34-0ubuntu0.16.04.1) but it is not going to be installed
                       Breaks: mysql-server
 mariadb-server-core-10.0 : Depends: mariadb-common (>= 10.0.34-0ubuntu0.16.04.1) but it is not going to be installed
 mysql-server : Depends: mysql-community-server (= 5.7.22-1ubuntu16.04) but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).


$ sudo dpkg --configure mysql-server
dpkg: dependency problems prevent configuration of mysql-server:
 mysql-server depends on mysql-community-server (= 5.7.22-1ubuntu16.04); however:
  Package mysql-community-server is not installed.
 mariadb-server-10.0 (10.0.34-0ubuntu0.16.04.1) breaks mysql-server and is installed.

dpkg: error processing package mysql-server (--configure):
 dependency problems - leaving unconfigured
Errors were encountered while processing:

To solve this problem, follow the instructions below:

sudo apt-get -f install

without any other parameters and later displaying all packages via:

sudo dpkg -l | grep mariadb
sudo dpkg -l | grep mysql

remove problematic packages in the right order:

sudo apt-get --purge autoremove package_name

After the complete removal of all problematic packages, re-install MySQL

  • mysql problem, mysql issue, EXPKEYSIG
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