QTPlasmaC can't find Python3-serial

Hi,
I have been trying to get my QTPlasmaC to talk to my Hytertherm 45 using the RS485 interface.
I am running QTPlasmaC with Buster.

I can get the interface to work with the test program which indicates the RS485 is working OK but when I generate a simple config including the Powermax port using the PNCconf Wizard and try and run it  get the following error message:-

--- QtVCP Screen Started on: Tue, Oct 31 2023 19:49:19 ---
--- my_LinuxCNC_machine - QtPlasmaC v1.236.290, powered by QtVCP on LinuxCNC v2.10.0-pre0-2069-g9de3c86d4 ---
Tue31 19:49: Module Error:
python3-serial cannot be found
Install python3-serial or linuxcnc-dev
Tue31 19:49: Tool 0: torch

I have tried installing python3-serial but it tells me it is already installed.
I can run a configuration without a Powermax port defined just fine, but with the Powermax port set it will not work.
If anyone had any idea what is causing this fault I would be very grateful for some advice.
Many thanks

maybe you have 3.4 and need 3.6 ....or 3.8 .... verify these first. .... $ python3 -version

Can you try starting linuxcnc from a terminal to see if there are any other error messages or warnings.
 

Thanks for the replies.
phillc54.  Did as suggested.  Everything looks ok except for the last few lines:-

hm2/hm2_7i96s.0: registered
Found file(lib): /usr/share/linuxcnc/hallib/qtplasmac_comp.hal
Found file(REL): ./custom.hal
Starting DISPLAY program: qtvcp
USRMOT: ERROR: command 30 timeout
emcMotionInit: emcTrajInit failed

Looks like the problem is in qtvcp - which is not really a surprise.

bkt.  Python version is 3.7.3.  I'm not sure if that is adequate or not.

Any further ideas?

Thanks
Don

what is the output of:

 

snowgoer540 -
Output fromapt show python3-serial | grep -i versionis
python3-serial is version 3.4-4

Don