hp-setup does not work

After installing without any problem the hplp package and re-starting the computer, when I try to run "hp-setup" the following message appears:

jordi@jordi-Lenovo-B50-70:~$ hp-setup
Traceback (most recent call last):
  File "/usr/bin/hp-setup", line 48, in <module>
    from base import device, utils, tui, models, module, services, os_utils
  File "/usr/share/hplip/base/device.py", line 42, in <module>
    from . import status
  File "/usr/share/hplip/base/status.py", line 50, in <module>
    import hpmudext
ImportError: /usr/lib/python2.7/dist-packages/hpmudext.so: undefined symbol: hpmud_make_mdns_uri
jordi@jordi-Lenovo-B50-70:~$

My op system is Ubuntu 18.04

What should I do?
Thanks a lot in advance
So long