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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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1 Answers1

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

JrV
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