Problem with apt upgrade

Problem Description

When I try to run apt-get update && apt-get upgrade, it fails It says sympl-core is not fully installed, but fails when it tries to sort it.

Any Error Messages

W: GPG error: buster-backports InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 648ACFD622F3D138 NO_PUBKEY 0E98404D386FA1D9
E: The repository ' buster-backports InRelease' is not signed.
dpkg: error processing package sympl-core (--configure):
 installed sympl-core package post-installation script subprocess returned error exit status 100
Errors were encountered while processing:
E: Sub-process /usr/bin/dpkg returned an error code (1)


  • Sympl Version [10.0]:
  • Sympl Testing Version? [No]
  • Debian Version [Buster]:
  • Hardware Type? [Pi]
  • Hosted On? [lan]

Assuming you’re actually using Rasberry Pi OS, it’s got a few small differences to normal Debian, but if you remove the buster-backports repo from /etc/apt/sources-list.d then you should be able to use normal apt (rather than apt-get, as it handles a good few cases which cause apt-get to fail) to update and upgrade okay.

I tried removing the backports, but still got errors. Then I noticed that I was using Bytemark mirrors. I removed them and most of the problems vanished. Seems that Oh No Mart are continuing their fall from grace.
Thanks for the tip about using apt instead of apt-get. I’ll give that a spin.

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