imran@imran-System-Product-Name:~$ sudo apt-get remove --purge mysql-server-5.5
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  libdbd-mysql-perl libdbi-perl libterm-readkey-perl mysql-client-5.5
Use 'apt-get autoremove' to remove them.
The following packages will be REMOVED:
  mysql-server* mysql-server-5.5*
0 upgraded, 0 newly installed, 2 to remove and 0 not upgraded.
2 not fully installed or removed.
After this operation, 32.8 MB disk space will be freed.
Do you want to continue? [Y/n] y
(Reading database ... 164304 files and directories currently installed.)
Removing mysql-server (5.5.40-0ubuntu0.14.04.1) ...
Removing mysql-server-5.5 (5.5.40-0ubuntu0.14.04.1) ...
Purging configuration files for mysql-server-5.5 (5.5.40-0ubuntu0.14.04.1) ...
dpkg: warning: while removing mysql-server-5.5, directory '/etc/mysql' not empty so not removed
Processing triggers for man-db (2.6.7.1-1ubuntu1) ...
imran@imran-System-Product-Name:~$