[X2Go-User] system upgrade

Greetings

Just did a system upgrade (debian bookworm) and I have an updated system except for x2go.

The following is what I am getting. (Have tried changing bullseye to bookworm and the result is the same.)

http://packages.x2go.org/debian/dists/bullseye/InRelease: Key is stored in legacy trusted.gpg >keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.

Have looked for a specific technique to update the key storage. Can't find such. Checked with the x2go website to see if there is any somewhat current information - - - except the website is current for - - well, some time ago.

Please - - - any suggestions for how to remove this 'issue'?

TIA