Output from apt update Question

[Chris Green]

On Fri, Oct 01, 2021 at 09:14:33PM +0100, Colin Watson wrote:
> On Fri, Oct 01, 2021 at 03:03:18PM -0500, Jay Ridgley wrote:
> > E: The repository 'http://ppa.launchpad.net/hplip-isv/ppa/ubuntu focal
> > Release' does not have a Release file.
> 
> That PPA hasn't had any activity since Ubuntu 11.04.  It is almost
> certainly useless to you, and you should delete it (it's probably
> somewhere under /etc/apt/sources.list.d/).
> 
Not directly rated to this particular issue but I do think the
handling of files in /etc/apt leaves a lot to be desired.  After
upgrades from one Ubuntu version to the next I often spent quite a
while sorting out the resulting confusion of files there.

-- 
Chris Green