How to remove libpng12 repository

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?

sudo add-apt-repository --remove ppa:linuxuprising/libpng12 should do the trick

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If I may ask, what are you doing that requires a ppa or the wine dll version of libpng12?

settings > driver manager > other software

remove the ppa

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Thanks it did!!!

respectfully, do you want to try and read the first sentence of the op again