This is a feature, not a bug. We worked hard to not require gnupg anymore. apt-key does not work without gnupg (or gpg). It's also deprecated and has been obsoleted over 10 years ago with the introduction of trusted.gpg.d.
The correct thing to do here is to
wget -O /etc/apt/trusted.gpg.d/syncthing.asc https://syncthing.net/release-key.txt
or
wget -O <other path>/syncthing.asc https://syncthing.net/release-key.txt
and add signed-by=<other path>/syncthing.asc to your sources.list entry.
This is a feature, not a bug. We worked hard to not require gnupg anymore. apt-key does not work without gnupg (or gpg). It's also deprecated and has been obsoleted over 10 years ago with the introduction of trusted.gpg.d.
The correct thing to do here is to
wget -O /etc/apt/ trusted. gpg.d/syncthing .asc https:/ /syncthing. net/release- key.txt
or
wget -O <other path>/syncthing.asc https:/ /syncthing. net/release- key.txt
and add signed-by=<other path>/syncthing.asc to your sources.list entry.