Ok, so about a year ago I installed everything on this page https://flathub.org/setup/Ubuntu so please tell me the commands I need to enter to remove everything I installed on that page, I want it all gone. So yeah everything I installed on that page I want removed and deleted from my computer.
I do believe that step number 2 was the gnome software right? Well I tried this command and this is what I got
sudo apt remove gnome-software-center
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
E: Unable to locate package gnome-software-center
So it says it can't locate it but gnome software is indeed installed on my PC and I can launch it and use it just fine so I have no idea why it can't be located. I just want everything I installed from that page deleted and gone from my PC. So yeah I'm stumped.
Edit: This is what step number 2 installed (refer to step number 2 here https://flathub.org/setup/Ubuntu ), this is what I want gone from my computer, here I took a screenshot of it, this is what I'm trying to delete from my PC
