There appears to be a bug in newer versions of gpg which basically means you can't authenticate (at least) some packages, including Nextcloud desktop.
If this command --
gpg --keyserver keyserver.ubuntu.com --recv-keys 1FCD77DD0DBEF5699AD2610160EE47FBAD3DD469
...results in "gpg: keyserver receive failed: Server indicated a failure", then you're seeing the bug.
More info: https://dev.gnupg.org/T3168
applies to Ubuntu 18.04 and Mint 19.1 (probably many other distros)
@woozle but the page says it's a DNS problem from 2017
@oreolek My tests suggest it's a problem recognizing the validity of the file format, in that I tried it on a local copy of the same key, and gpg couldn't see any data in the file.
It should, however, be taken into consideration that I may not actually know what I'm doing. (not that the docs make that an easy thing to know)
@woozle well i tried it on ubuntu 18.04 with no problems, and this anecdotal evidence does nothing to prove or disprove bug existence, so idk either
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