Repository 'http://maven.xwiki.org stable/ Release' is no longer signed

There seems to be a problem with the Maven repository:


Get:5 http://maven.xwiki.org stable/ Release [1308 B]
Ign:6 http://maven.xwiki.org stable/ Release.gpg

Reading package lists… Done
E: The repository ‘http://maven.xwiki.org stable/ Release’ is no longer 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.

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Indeed, sorry about that, we had a problem with what is now the former gpg secret key, and we just created a new one.

That means you will have to register the new public key:

wget -q "https://maven.xwiki.org/public.gpg" -O- | sudo apt-key add -
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