qtVCP not working for RPI 2.8 image

If you start linuxcnc from a terminal, it should print out some startup info and any error messages. That way you may get a clue what the problem is.

Sorry, I had to do it in the first post...
I attached the log,
but I think this is the point:

[QTvcp.QTVCP.QT_MAKEGUI][CRITICAL] module 'qtdragon_handler' skipped - import error: (qt_makegui.py:280)
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/qtvcp/qt_makegui.py", line 278, in _load_handlers
mod = __import__(basename)
File "/home/pi/linuxcnc/configs/qtdragon/qtdragon_handler.py", line 17, in <module>
from vtk_backplot import VTKBackPlot
File "/home/pi/linuxcnc/configs/qtdragon/vtk_backplot.py", line 13, in <module>
import vtk.qt
ImportError: No module named qt
Shutting down and cleaning up LinuxCNC...
task: 1552 cycles, min=0.000164, max=0.011806, avg=0.009890, 0 latency excursions (> 10x expected cycle time of 0.010000s)
Note: Using POSIX realtime

Sorry I'm not a linux guy..

ImportError: No module named qt

Is QT installed?
If you type: You should see libvtk7.1-qt along with a bunch of other stuff.
Also, not sure about double clicking on a deb package. To install it, you need to :

ok, this is what I get: I see 7.1.1-qt5py2-1 so looks like it's installed as far as I can tell.
I also tried to reinstall the package but no luck.
Just for curiosity I noticed there are more python version installed (2.6, 2.7, 3 and 3.7) maybe that's normal but I don't know where to look at...
thank you

It does appear that VTK is installed, but is PyQt5 installed?
In a terminal, start a python interactive session: If no error, then PyQt5 is installed. If no error, then vtk.qt is installed.
I believe that debian distros come with both python2.7 and python3 already installed. The libraries for PyQt5 are in /usr/lib/python2.7/dist-packages and the vtk libraries are in /usr/local/lib/python2.7/site-packages

I run the commands and vtk.qt is installed..
So I wanted to restart from a fresh image, something changed but still not working.
This are ALL, and the only steps I did:

- flashed the linuxcnc-2.8.0-pi4 image
- did NOT performed any "update" nor "upgrade"
- did NOT install python-vtk6 as per my previous image
- open linuxcnc and load a sim (so I created the config folder)
- copied your files in "configs" (in a subfolder called "qtdragon")
- installed your package - added and to .bashrc as suggested by Scott


I then performed all your check with succes: and with no error

at this point I ran linuxcnc and choose "qtdragon_xyz"
It crashed but I didn't find the reason. I attach the log1.
Run a second time and It crashed again (but shorter output) attached in log2. (I think the first one also created some default files/configs)
If I remove the two lines added in .bashrc I have an error regarding vtk not found.

Hope this make sense to you...