Remove complete DE Cinnamon on Linux Mint:

# sudo apt-get install ppa-purge
# sudo apt-get purge --auto-remove cinnamon
# sudo apt-get autoremove


Remove complete DE Unity (untuk ubuntu 12.10 ke bawah)
# sudo apt-get remove unity unity-2d unity-2d-panel unity-2d-spread unity-asset-pool unity-services unity-lens-files unity-lens-music unity-lens-applications gir1.2-unity-5.0 unity-common indicator-sound indicator-power indicator-appmenu libindicator7 indicator-application indicator-datetime indicator-messages libnux-2.0-0 nux-tools libunity-misc4 unity-2d-common

Untuk ubuntu 12.10
# sudo apt-get --purge remove appmenu-gtk appmenu-gtk3 appmenu-qt bamfdaemon firefox-globalmenu indicator-appmenu libbamf3-0 liblightdm-gobject-1-0 libufe-xidgetter0 libunity-core-6.0-5 libunity-misc4 libunity-webapps0 lightdm lightdm-remote-session-freerdp lightdm-remote-session-uccsconfigure overlay-scrollbar overlay-scrollbar-gtk2 overlay-scrollbar-gtk3 thunderbird-globalmenu ubuntu-desktop unity unity-asset-pool unity-common unity-greeter unity-lens-applications unity-lens-files unity-lens-gwibber unity-lens-music unity-lens-photos unity-lens-shopping unity-lens-video unity-scope-gdocs unity-scope-musicstores unity-scope-video-remote unity-services unity-webapps-common unity-webapps-service xul-ext-unity xul-ext-websites-integration

NB :
sebulum dihapus install de yg lain dl... waktu login pilih default de yg kita inginkan, kemudianbaru dihapus unity nya..