Public bug reported:
peter@peter-Latitude-E6520:~$ sudo apt-get update
[sudo] password for peter:
Ign:1 http://cz.archive.ubuntu.com/ubuntu precise InRelease
Hit:2 http://security.ubuntu.com/ubuntu bionic-security InRelease
Hit:3 http://ppa.launchpad.net/jtaylor/keepass/ubuntu bionic InRelease
Hit:4 http://de.archive.ubuntu.com/ubuntu bionic InRelease
Hit:5 http://cz.archive.ubuntu.com/ubuntu precise Release
Hit:6 http://de.archive.ubuntu.com/ubuntu bionic-updates InRelease
Hit:7 http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu bionic InRelease
Hit:8 http://de.archive.ubuntu.com/ubuntu bionic-backports InRelease
Get:9 http://cz.archive.ubuntu.com/ubuntu precise Release.gpg [198 B]
Hit:10 http://ppa.launchpad.net/webupd8team/y-ppa-manager/ubuntu bionic
InRelease
Ign:9 http://cz.archive.ubuntu.com/ubuntu precise Release.gpg
Fetched 198 B in 2s (116 B/s)
Reading package lists... Done
W: GPG error: http://cz.archive.ubuntu.com/ubuntu precise Release: The
following signatures couldn't be verified because the public key is not
available: NO_PUBKEY 40976EAF437D05B5
** Affects: ubuntu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1814803
Title:
ubuntu 18.04 apt-get update key error the public key is not available:
NO_PUBKEY 40976EAF437D05B5
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