How do I remove that manuelscheider repository??
to delete a uncompatile or bad repository try this command in the termnial
$ sudo nano /etc/apt/sources.list
when nano is openned, remove that bad repository (manuelscheider) and press
Ctrl + O to save and Ctrl + X to exit.
After this operation run this command in the terminal
$ sudo apt-get update && sudo apt-get upgrade -y
And that is all. I hope help you