kian@kian-OptiPlex-GX620:~$ sudo apt-get purge light-locker
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  abiword abiword-common apturl apturl-common evolution-data-server-common
  gecko-mediaplayer gnome-mplayer language-selector-gnome liba52-0.7.4
  libabiword-3.0 libappindicator1 libass4 libavresample1 libbluray1
  libcamel-1.2-45 libchamplain-0.12-0 libchamplain-gtk-0.12-0 libclutter-1.0-0
  libclutter-gtk-1.0-0 libcogl-pango15 libcogl15 libdca0 libdirectfb-1.2-9
  libdiscid0 libdvdread4 libebook-contacts-1.2-0 libedataserver-1.2-18
  libenca0 libgbm1 libgda-5.0-4 libgda-5.0-common libgmlib1 libgmtk1
  libgmtk1-data libgpod4 libical1 libjs-jquery libloudmouth1-0 liblua5.2-0
  libmad0 libmhash2 libmusicbrainz3-6 libots0 libpostproc52 libquvi-scripts
  libquvi7 libraptor2-0 librasqal3 librdf0 libtelepathy-glib0 libtidy-0.99-0
  libts-0.0-0 libvdpau1 libwmf0.2-7 libwpd-0.9-9 libwpg-0.2-2 libwps-0.2-2
  libwv-1.2-4 libyajl2 lubuntu-core mplayer2 python-psutil tsconf xorg
Use 'apt-get autoremove' to remove them.
The following packages will be REMOVED:
  light-locker* light-locker-settings* lubuntu-desktop*
0 upgraded, 0 newly installed, 3 to remove and 4 not upgraded.
After this operation, 1,235 kB disk space will be freed.
Do you want to continue? [Y/n]