Synchronize repository 'focal-updates'; product 'Ubuntu-20.04'; - error ngpg: signing failed: Unusable secret key\n'

Hi,

In the last few days, I’ve been encountering an error when trying to update Ubuntu repositories. The error message I receive is:

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b'gpg: skipped "Debian-version-all": Unusable secret key\ngpg: signing failed: Unusable secret key\n'

I’ve attached a screenshot of the issue for reference.

Could you please help me resolve this?

Thanks :slight_smile: