Hi -
This is not a question, just the result of my solution to a problem that I could find a direct answer to. I am running UBUNTU 20.10 on a Dell Inspiron 11-3162 using an Elecraft KX3. The problem I was having seemed to be that the USB port number changed on re-boot. Flrig never seemed to have any trouble, but it was being a real headache for me with cqrlog. If there is a way in the program to solve this issue, I never found it and would be appreciative of a comment telling me how it is supposed to work.

My solution was to search for a way to assign the radio to a port or device name that would not change on re-boot. Here is what I found:

Find the device vendor & product numbers:
$ lsusb
which returns several lines including:
Bus 001 Device 006: ID 0403:6001 Future Technology Devices International, Ltd FT232 Serial (UART) IC

Knowing what devices I had plugged into the USB port, I decided that the above line was describing the serial interface for my Elecraft KX3.

I used that information to assign the it to a device name. I chose RADIO, but a name of your choice could v=be used instead.

edit:
$ sudo gedit /etc/udev/rules.d/50-usb.rules
using your favorite editor, to include the line:
SUBSYSTEM=="tty", ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6001", SYMLINK+="RADIO", MODE="0666"

If you want non-root users to be able to use these, then add
, MODE="0666"
to the end of the line.

Now, in cqrlog I set my device to
/dev/RADIO
and all of the radio parameters to "default"

After a reboot, communication is solid.