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If I perform sudo apt-get update. I obtain:

GPG error: http://cdn-fastly.deb.debian.org/debian jessie Release: The following signatures were invalid: EXPKEYSIG 7638D0442B90D010 Debian Archive Automatic Signing Key (8/jessie) <ftpmaster@debian.org> EXPKEYSIG CBF8D6FD518E17E1 Jessie Stable Release Key <debian-release@lists.debian.org> 75DDC3C4A499F1A18CB5F3C8CBF8D6FD518E17E1
E: The repository 'http://http.debian.net/debian jessie Release' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.

How can I fix this?

Thanks for the feedback.

My installed Ubuntu: Distributor ID: Ubuntu Description: Ubuntu 20.04.5 LTS Release: 20.04 Codename: focal

matigo
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JrV
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    I'd remove that source from your system, as you won't get anything useful from it. Debian Jessie is EOL & has been for some time! - refer https://www.debian.org/News/2020/20200709 – guiverc Jan 05 '23 at 09:52
  • What is the best approach to perform this safely? – JrV Jan 05 '23 at 10:51
  • I'd suggest reversing how you added it... ie. if you used a text editor to add it to /etc/apt/sources.list then re-edit that file & remove it. If you added it as a source in /etc/apt/sources.list.d/ then remove that added file. Given Debian jessie has been EOL since 30-June-2020 - you've likely only added it recently (~2.5 years living with that message makes me think it was recent). – guiverc Jan 05 '23 at 10:54

1 Answers1

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Solved. Removed the source from /etc/apt/sources.list

JrV
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