[chirp_users] Errno 13 on activating radio clone, plus Permission denied.

Just installed CHIRP-daily 20210429 to use with my Yaesu FTM3207D (FTM-3200D on menu).

When connecting the radio to the laptop (Linux Ubuntu 20.04) and starting CLONE I keep on receiving an error message errno-13 regardless of which ttysx I select. It also tells me permission denied. And so no connection made.

Which permission needs changing and how please? There's no provision for that within the CHIRP software, that I can see.

If its a Linux permission for the software (which I doubt), then why does the CHIRP software function in other respects?

Help would be appreciated, please?

Thanks and 73,