Make Your Own Custom Ubuntu/Gnome Remix

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Ubuntu 12.04/12.10

Step 1. Install required packages...

sudo apt-get install gdm gnome-shell gnome-tweak-tool synaptic deborphan

(During installation you will be asked to select a display manager make sure to select GDM "Gnome Display Manager" I have not tested this using Light DM)

Step 2.  Restart & Login to Gnome-Shell

Step 3.  Start removing Unity...

sudo apt-get remove unity unity-2d unity-2d-common unity-2d-panel unity-2d-shell unity-2d-spread unity-asset-pool unity-common unity-lens-applications unity-lens-files unity-lens-music unity-lens-video unity-scope-musicstores unity-scope-video-remote unity-services indicator-messages indicator-status-provider-mc5 appmenu-qt appmenu-gtk appmenu-gtk3 lightdm unity-greeter overlay-scrollbar zeitgeist zeitgeist-core zeitgeist-datahub activity-log-manager-common activity-log-manager-control-center

Step 4.  Begin removing dependencies...

sudo apt-get autoremove

Step 5.  Clean up...

sudo apt-get purge `deborphan`

(This command will need to be performed multiple times until there are no more dependencies to be removed)

Step 6.   Remove Unity config files

sudo dpkg --purge `dpkg -l | egrep "^rc" | cut -d' ' -f3`

Step 7.  Add the Gnome3Team PPA to update Precise to the latest Gnome packages that have been left out of the 12.04 LTS repositories

sudo apt-add-repository ppa:gnome3-team/gnome3

Step 8.  Update your system and install/upgrade packages

sudo apt-get update && sudo apt-get dist-upgrade

Step 9.  (Optional) Clean up your “apt” cache

sudo apt-get clean

Step 10.  Smile, Unity is gone!

:)