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I am having virtually the same problem, but with a twist. Using the qtvcp gcode_graphics widget, which uses qt5_graphics, I can load any .ngc file with any tool number no problem. However, when the display is a VTK render window, any ngc file that specifies a tool greater than 9 causes a gcode interp error. For example, if line 3 in the ngc file contains:it works fine. If I change the line to:it throws:I looked for the reason in gcodemodule.cc but C++ is beyond my brain capacity.
BTW, T13 is a valid tool. If I specify an invalid tool, so long as it's less than 10, it only throws a tool not found in tool table error, which is perfectly normal. Any insights would be greatly appreciated.
Jim
 

try: sudo apt update and try again
It just worked for me. do you have internet access?
the script is here but you should not need it
forum.linuxcnc.org/ethercat/53785-instal...thercat-repositories

They don't _have_ to be:

0 = 7i77 #1 digital I/O
1 = 7I77 #1 analog output
2 = 7I77 #1 expansion channel

Buts that's the way the standard firmware arranges them.