I was trying to get Umodel to work so I added a LibPng12 repository to my Kubunto 24.04 system. It needs Libpng12 to run on Linux, I discovered later you can just run it through wine.
Whenever I run an update I get this error:
Err:10 https://ppa.launchpadcontent.net/linuxuprising/libpng12/ubuntu noble Release
404 Not Found [IP: 185.125.190.80 443]
Reading package lists... Done
How do I remove this repository?