george@Bridgeport:~$ linuxcnc
LINUXCNC - 2.9.4
Machine configuration directory is '/home/george/linuxcnc/configs/sim.axis'
Machine configuration file is 'axis.ini'
Starting LinuxCNC...
linuxcnc TPMOD=tpmod HOMEMOD=homemod EMCMOT=motmod
iopl() failed: Operation not permitted
cannot gain I/O privileges - forgot 'sudo make setuid' or using secure boot? -parallel port access is not allowed
Note: Using POSIX realtime
Found file(lib): /usr/share/linuxcnc/hallib/core_sim.hal
Found file(lib): /usr/share/linuxcnc/hallib/sim_spindle_encoder.hal
Found file(lib): /usr/share/linuxcnc/hallib/axis_manualtoolchange.hal
Found file(lib): /usr/share/linuxcnc/hallib/simulated_home.hal
Found file(lib): /usr/share/linuxcnc/hallib/check_xyz_constraints.hal
Found file(REL): ./cooling.hal
note: MAXV     max: 5.000 units/sec 300.000 units/min
note: LJOG     max: 5.000 units/sec 300.000 units/min
note: LJOG default: 0.250 units/sec 15.000 units/min
note: jog_order='XYZ'
note: jog_invert=set()
[GladeVCP][INFO]  Logging to: /home/george/gladevcp.log (logger.py:106)
Traceback (most recent call last):
  File "/usr/bin/gladevcp", line 54, in <module>
    import gladevcp.makepins
  File "/usr/lib/python3/dist-packages/gladevcp/__init__.py", line 1, in <module>
    from .hal_pythonplugin import *
  File "/usr/lib/python3/dist-packages/gladevcp/hal_pythonplugin.py", line 1, in <module>
    from ncam import NCam
  File "/usr/lib/python3/dist-packages/ncam.py", line 28, in <module>
    from lxml import etree
ModuleNotFoundError: No module named 'lxml'