I get this error message when I try to upgrade to 19.04
E: The repository 'http://archive.canonical.com/ubuntu raring Release' no longer has a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
I've already edit the software sources list and removed all the entries that have "raring ringtail".
Is it hidden in a secret directory? How can I find it and remove it from the system?
Bookmarks