Can't install Darktable from OBS, invalid signature due to expired key

I was attempting to install Darktable 3.4 on Ubuntu Studio 20.04, following the instructions for using the OBS repository. It failed, apparently due to an expired certificate:

W: GPG error:  InRelease: The following signatures were invalid: EXPKEYSIG 040524A84C70D8B5 graphics:darktable OBS Project <>
E: The repository '  InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

Can I expect this to go away in the near future? Or should it be reported to the OBS maintainers?


when did you add the repo to your system? I thought we fixed that expired key issue a long time ago.

pub   rsa2048 2017-12-26 [SC] [expires: 2022-05-16]
uid           [ unknown] graphics:darktable OBS Project <>

is what I see for the key.

I did this earlier today (2021-01-01).

Hmmm… I had that key listed twice. I removed it and re-added it, and now I am able to install Darktable 3.4.

Thank you for the help!