Thanks Karma. I did a bit of research to understand aptitude and apt-get... its true that aptitude doesn't come with the 2.0.1.

I executed the following revised commands but again, nothing happened. Kstars and INDI server can still be run! Any clue?

sudo apt-get purge indi-bin libindi-data libindi1 libindidriver1
sudo apt-get purge kstars kstars-data
sudo apt-add-repository ppa:mutlaqja/ppa
sudo apt-get update
sudo apt-get install indi-full kstars-bleeding