Thanks @jibel I did this to remove cinnamon, then ran $update-manager and it worked!
sudo apt-get install ppa-purge sudo apt-get purge --auto-remove cinnamon sudo apt-get autoremove
Thanks @jibel
I did this to remove cinnamon, then ran $update-manager and it worked!
sudo apt-get install ppa-purge
sudo apt-get purge --auto-remove cinnamon
sudo apt-get autoremove