Yes, do try pushing the cable into your radio with more force, there is an issue of some cables not fitting the radio very well.

I forgot about this, otherwise proceed to my message about seeing if you're in the right group in your Ubuntu installation.

This is a normal usual step, often people do not read the various pages explaining how to install CHIRP.

CHIRP has such a page: https://chirp.danplanet.com/projects/chirp/wiki/Running_Under_Linux

It also says under Ubuntu the serial ports are in group "dialout" and tells you how to get your user into that group. Don't change "$USERNAME" that's just a universal shortcut for the user's username.

In terminal do this: sudo addgroup "$USERNAME" dialout

serial port permissions

Note that you may need to adjust permissions on the /dev/tty(something) device, or add your users who want to use Chirp to the "dialout" group in order to let non-privileged users access the serial device.

This issue is often indicated by an "access denied" error when accessing serial port.

On most Linux distros this is accomplished with:

sudo addgroup "$USERNAME" dialout

You will then need to log out and back in for it to take effect.

Regards,

David