I followed this tutorial to install Bitdefender and now I can't update or upgrade because I'm getting a whole bunch of different erorrs. Screenshot deleted.
I still am getting some errors in my terminal when I try sudo apt update, I followed the tutorial that the previous answer had and it cleared alot of the messages. Screenshot deleted.
Sorry Soren A, I did not know I was not allowed to use screenshots. It won't happen again :)
Here is the output using the grep -nr bitdefender /etc/apt/sources* command : /etc/apt/sources.list.save:58:deb http://download.bitdefender.com/repos/deb/ bitdefender non-free
grep -nr bitdefender /etc/apt/sources*
and add the output to your question. – pLumo Dec 01 '21 at 07:32