after upgrading from Kubuntu 19.10 to 20.04 another problem occurs.
The DX-Cluster Window "Telnet" does not work or stops after a few lines. The telnet connection in the Linux console works fine.
After a restart of CQRLOG spots appear in the "telnet" window. After some time, however, the window freezes. After a restart the "telnet" window works again, but then freezes again after some time.
The DX-Cluster Window "Web" in CQRLOG works as well.
A compilation of the current source code does not change the behaviour.
The Telnet DX cluster is especially interesting for those OM's that are QRV in CW. There they can connect the reverse beacon net via Telnet.
This makes it much easier to track CW activity, especially at close range, than via the regular DX cluster.
Currently I use the RBN display via the web browser as a workaround. Of course the bandmap and "Callsign alert" will not work with this.