I am trying to install a tool called Stacer, to clean junk files from my PC (Ubuntu 20.04 LTS).
The app is installed but everytime is use sudo apt-get update && sudo apt-get upgrade, I get the following error
Ign:11 http://ppa.launchpad.net/oguzhaninan/stacer/ubuntu focal InRelease
Err:12 http://ppa.launchpad.net/oguzhaninan/stacer/ubuntu focal Release 404 Not Found [IP: 2001:67c:1560:8008::15 80] Reading package lists... Done E: The repository 'http://ppa.launchpad.net/oguzhaninan/stacer/ubuntu focal Release' does not have a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details.
What should I do?
EDIT 1 The question is not answered at What can I do if a repository/PPA does not have a Release file?.
They suggest to remove the PPA. But the error message says it is disabled by default. So there might be a way to enable it.
The most recent version of Ubuntu supported by the PPA is disco, not focal. A solution is to go in the folder /etc/apt/sources.list.d and open the file called something similar to stacer.list
Inside the file, replace the string:
deb http://ppa.launchpad.net/oguzhaninan/stacer/ubuntu focal main
with
deb http://ppa.launchpad.net/oguzhaninan/stacer/ubuntu disco main
(in other words, replace focal with disco)
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