[X2Go-User] system upgrade

[o1bigtenor]

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