Thanks Till. Still no luck:
Remove and reinstall:
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Preparing to unpack .../0-printer-driver-postscript-hp_3.20.3+dfsg0-2_amd64.deb
...
Unpacking printer-driver-postscript-hp (3.20.3+dfsg0-2) over (3.20.3+dfsg0-2)
...
Preparing to unpack .../1-libsane-hpaio_3.20.3+dfsg0-2_amd64.deb ...
Same problem installing 3.20.5 on Ubuntu 20.04 (after an upgrade from 18.04)
Looks like hplip uses Python 2.7, but the python-pyqt5 package (Python 2
bindings for Qt5) is no longer available in the distro.
The corresponding package for Python3 is python3-pyqt5, which is available
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You
