Pangolin - Update, Clean - Boot to CLI - GUI missing

In Tuesday Januaty 7, 2014 ... I:

Purge Unity Lens with:
* sudo apt-get purge unity-lens-video unity-lens-music

... and remove Zeitgeist with:
* sudo apt-get remove python-zeitgeist zeitgeist-core zeitgeist-datahub

after that, in order to upgrade my VGA, which is INTEL (I used Compaq CQ40-328TU lappie) ... I use the instruction from

Intel Graphic section.
For Ubuntu 12.04 LTS, you'll need to update your mesa stack using the x-updates PPA.
On the command line (as root), run

apt-add-repository ppa:glasen/intel-driver
apt-get install --install-recommends linux-generic-lts-quantal xserver-xorg-lts-quantal libgl1-mesa-glx-lts-quantal
apt-get update
apt-get -y dist-upgrade
glxinfo | grep "OpenGL version" # verify you have mesia 9.1.6
Then log out and back in, or reboot.

In Wednesday, January 08, 2014
I do a "System Update" and reboot
And clean the "Janitor" by using "Ubuntu Tweak"
* and while it do some cleaning, it ask me weather I wish to delete 3 files ... and I say YES ... Finished, reboot ... after that ... my Pangolin boot into CLI (Command Line Interface) ... not GUI (Graphical User Interface).

How can I make Pangolin boot as ussually?
Please guide me ...

Yesterday, after update manager, i unable to boot to ubuntu. it boot to command prompt and there is:

ubuntu 12.04.3 LTS czgirb tty1
czgirb login:

what should i do?

I do:
sudo service lightdm stop ... it show me "stop: unknown instance:"
sudo lightdm --test-mode ... it show me a lot of Command and Stop in:
* checking battery state...
sudo apt-get install ubuntu-desktop ... but it said: "the newest already"

After having an instruction

After having an instruction from mastablasta ( and do:

sudo apt-get install --install-recommends linux-generic-lts-raring xserver-xorg-lts-raring libgl1-mesa-glx-lts-raring

everything is fished.
Thank you very much to mastablasta (