How to fix this 404 Not Found problem? This is the message I got when I tried to run ‘sudo apt update’. But this happens most of the times making me unable to download/install anything. Please, because I’m a noob in linux.
The 404 error, just like when you reach a website that is no longer active, means that repository is no longer active. Removing the ppa is the only way to fix it, until such time you find a new ppa for that product.
To remove using terminal:
To remove using GUI: