This is what I see:
Maybe I should add some files to some directory. I'm extremely new to ubuntu so please give a detailed solution.
This is what I see:
Maybe I should add some files to some directory. I'm extremely new to ubuntu so please give a detailed solution.
Here you have two problems with repositories - they do not have packages for Ubuntu 20.04 LTS.
So you need to remove these repositories at first with
sudo add-apt-repository -r ppa:danielrichter2007/grub-customizer
sudo add-apt-repository -r ppa:ppsspp/stable
and then add repository which provides ppsspp package:
sudo add-apt-repository ppa:samoilov-lex/retrogames
sudo apt-get update
sudo apt-get install ppsspp