remove cairo dock completely [duplicate]
If you look at the source package page of cairo-dock you'll get the list of packages to remove.
To fully remove this application you need to type the following command in a terminal:
sudo apt-get purge cairo-dock cairo-dock-core cairo-dock-data libgldi-dev libgldi3
Note:
cairo-dock-session is provided by the cairo-dock-data package (see this query on packages.ubuntu.com)