[ubuntu] gpg: no valid OpenPGP data found

In my case, the problem turned out to be that the keyfile was behind a 301 Moved Permanently redirect, which the curl command failed to follow. I fixed it by using wget instead:

wget URL
sudo apt-key add FILENAME

...where FILENAME is the file name that wget outputs after it downloads the file.

Update: Alternatively, you can use curl -L to make curl follow redirects.

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gpg: no valid OpenPGP data found