Hello everybody. I'm having a problem to fetch updates in AppCenter. It says in the details: "E: The repository 'http://ppa.launchpad.net/oguzhaninan/stacer/ubuntu focal Release' does not have a Release file. W: Updating from such a repository can't be done securely, and is therefore disabled by default. W: See apt-secure(8) manpage for repository creation and user configuration details" Anyone knows how to fix?
Hey, I assume you have added the repository manually to install some software. What this error tells you is that the repository has no release file for the Ubuntu version your system is built upon (for elementary OS 6.1 it's Focal Fossa). This means that while you can generally install software through this repository, it's not currently providing a release for your system. I would just remove the repo and try to install the software through other means.
