TASK ERROR: command 'apt-get update' failed: exit code 100

Oct 10, 2021
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Updated Proxmox cluster with licences and update fails.

x4 Proxmox 5.3-8 nodes clustered and each node shows that the subscription is valid.
I have tried manually running update command but both this and the scheduled proxmox task fail with this error.

Any assistance would be greatly appreciated.
 
PVE 5 is EOL and out of support (for more than a year). you are likely bitten by the recent expiry of the root certificate Let's Encrypt used to cross-sign their own root. I suggest upgrading to PVE 6.x and then PVE 7.x as soon as possible - to facilitate this you can either temporarily switch to PVE 5's no-subscription repository (no TLS there, so no problem upgrading) or temporarily enable Debian's LTS repository (contains a fixed libgnutls package which should allow apt to talk to the PVE enterprise repository again).

we are in the process of switching our CDN to use the shorter chain which does not contain the expired cross-signing root, which should make the workarounds no longer necessary.