Upgrade failure when adding janus apt repo

[LordAro]

Upgrade failure when adding janus apt repo

[mtlynch]

Thanks for reporting this, @LordAro!

@db39 - Can you see if you can reproduce this?

[db39]

@mtlynch - I've managed to reproduce the error on a fresh install of 2.5.0 attempting to update to 2.5.4.

Re-flashing the SD card with 2.5.4 or 2.6.0 is a workaround. But I'll take a look to see if I can find the underlying issue.

[db39]

So the problem is pretty clear from the error message:

Failed to update apt cache: W:GPG error: http://deb.debian.org/debian buster-backports InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 0E98404D386FA1D9 NO_PUBKEY 6ED0E7B82643E131, E:The repository 'http://deb.debian.org/debian buster-backports InRelease' is not signed.

apt won't install the required janus packages from the repository because the repository isn't signed. I'm not sure why the repository is no longer signed - I couldn't find anything after searching online.

After trying a few different methods, one solution is to run the following commands to add the keys using the ubuntu keyserver:

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 0E98404D386FA1D9
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 6ED0E7B82643E131

Then run the TinyPilot update through the web UI.

I couldn't find a debian keyserver, but the ubuntu one seems to work in this instance.