package mariadb-common 10.0.29-0ubuntu0.16.04.1 failed to install/upgrade: podproces zainstalowany skrypt post-installation zwrócił kod błędu 2

[Daniel]

I installed mariadb, next removed it and installed mysql, next I removed mysql by commands:

```
sudo apt-get remove --purge mysql-server mysql-client mysql-common
sudo apt-get autoremove
sudo apt-get autoclean
sudo apt-get install mariadb-server
```

and then error occurred.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: mariadb-common 10.0.29-0ubuntu0.16.04.1
ProcVersionSignature: Ubuntu 4.4.0-79.100-generic 4.4.67
Uname: Linux 4.4.0-79-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
Date: Sat Jun 17 22:55:50 2017
Dependencies: mysql-common 5.7.18-0ubuntu0.16.04.1
ErrorMessage: podproces zainstalowany skrypt post-installation zwrócił kod błędu 2
InstallationDate: Installed on 2015-08-30 (657 days ago)
InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
PackageArchitecture: all
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.2
 apt 1.2.20
SourcePackage: mariadb-10.0
Title: package mariadb-common 10.0.29-0ubuntu0.16.04.1 failed to install/upgrade: podproces zainstalowany skrypt post-installation zwrócił kod błędu 2
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.mysql.mariadb.cnf: [deleted]

[Daniel (gustaw-daniel)]

I fixed it by:

```
sudo rm -rf /etc/mysq
sudo rm -rf /var/lib/mysql
sudo apt-get remove --purge mysql-server mysql-client mysql-common
sudo apt-get autoremove
sudo apt-get autoclean
sudo apt-get install mariadb-server
```

[Faustin (fauust)]

Hi Daniel, thank you for taking time to report this and for providing a solution.

Please be carreful, /var/lib/mysql contains the DB data and should never be removed unless you know what you do.

More information on a workaround can be found there:
https://jira.mariadb.org/browse/MDEV-11170