You can uninstall or removes an installed libcache-memcached-managed-per package itself from Ubuntu 14.04 LTS (Trusty Tahr) through the terminal,
$ sudo apt-get remove libcache-memcached-managed-per
If you would like to remove libcache-memcached-managed-per and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove libcache-memcached-managed-per
If you use with purge options to libcache-memcached-managed-per package all the configuration and dependent packages will be removed.
$ sudo apt-get purge libcache-memcached-managed-per
If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.
$ sudo apt-get purge --auto-remove libcache-memcached-managed-per