Just did a fresh install of ElementaryOS Hera (5.1.2) and after updating, upgrading and installing some apps, also installing elementary-tweaks. I get this error (screenshot attached) and after removing all the custom added PPAs, cleaning the sources.list file and all, still can't fix the error, any help?
Additional information, i can search, find apps and see updates but i can't install any updates or new apps. I can install everything through the terminal but nothing from the AppCenter.