How to Upgrade kali 1.1.0 to 2.0
Now Kali Linux users can upgrade their Kali 1.x to Kali 2.0 without reinstalling whole operating system from scratch. To do this, you will need to edit your source.list entries, and run a dist-upgrade as shown below.
/etc/apt/sources.list in leaf pad
and delete all (else replace old kali sources ) and add
after finish hit reboot
this method will take 2.6GB of online data.. and take much time .. depends upon your dataspeed
you can also run this cmd in terminal (copy paste it )
cat << EOF > /etc/apt/sources.list
deb http://http.kali.org/kali sana main non-free contrib
deb http://security.kali.org/kali-security/ sana/updates main contrib non-free
apt-get dist-upgrade # get a coffee, or 10.