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Update Expired GPG Keys

Issue

When you try to upgrade a switch from Cumulus Linux 3.7.x to 3.7.16 with package upgrade, you see errors for expired GPG keys that prevent you from upgrading:

W: GPG error: http://repo3.cumulusnetworks.com CumulusLinux-3 InRelease: The following signatures were invalid: KEYEXPIRED 1522652605 KEYEXPIRED 1522652605 KEYEXPIRED 1522652605
W: GPG error: http://repo3.cumulusnetworks.com CumulusLinux-3-security-updates InRelease: The following signatures were invalid: KEYEXPIRED 1522652605 KEYEXPIRED 1522652605 KEYEXPIRED 1522652605
W: GPG error: http://repo3.cumulusnetworks.com CumulusLinux-3-updates InRelease: The following signatures were invalid: KEYEXPIRED 1522652605 KEYEXPIRED 1522652605 KEYEXPIRED 1522652605

Resolution

Download the new repository keys, then upgrade the switch:

cumulus@switch:~$ wget http://repo3.cumulusnetworks.com/public-key/repo3-2023-key
cumulus@switch:~$ sudo apt-key add repo3-2023-key
cumulus@switch:~$ sudo -E apt-get update
cumulus@switch:~$ sudo -E apt-get upgrade