How can I undo adding a PPA and installing packages from it?

Question

I was following a guide and did this:

sudo add-apt-repository ppa:gwendal-lebihan-dev/cinnamon-stable   
sudo apt-get update    
sudo apt-get install cinnamon nemo

Now I am having a lot of trouble due to this. How can I undo these actions?

Answer 1

Thanks to Takkat.

sudo apt-get install ppa-purge
sudo ppa-purge ppa:gwendal-lebihan-dev/cinnamon-stable
sudo apt-get purge cinnamon nemo

Then restart.