Hello,
at leat on Debian trixie, your SHA1 signing key is deprecated since yesterday and is not accepted any more.
Regards Christoph
Hello,
here is a merge request for it: https://gitlab.x2go.org/x2go/x2go-keyring/-/merge_requests/2
@Christoph: extrepo-data is updated, so you can run extrepo update apt update to refresh your sources, if you installed it with extrepo.
Best Regards, Juri Grabowski