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I keep getting this message when running an update:

The repository '[http://ppa.launchpad.net/landscape/19.10/ubuntu  Release][1]' does not have a Release file
Updating from such a repository can't be done securely, and is therefore disabled by default.

See apt-secure(8) manpage for repository creation and user configuration details.
BeastOfCaerbannog
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Matthew
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    Which Ubuntu version you are using? – Pilot6 Jan 10 '21 at 14:14
  • 19.10 has gone end of life. Please remove any reference in your system and replace it by a current version – Rinzwind Jan 10 '21 at 15:52
  • I'm using 20.04, so yes I've had to carefully track down any reference of that particular repo, and manually replace it. Problem is solved now with a little more understanding of apt-key and versions. – Matthew Jan 11 '21 at 06:19

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