HPLIP: Some packages not installing

I installed HPLIP on my raspberry pi to use CUPS as per [here](https://unix.stackexchange.com/questions/511669/cups-selecting-a-driver-for-a-hp-printer/511673#511673) but some packages are simply not installing. I have tried:

apt-get -f install hplip

,

apt-get install qt4-default qt4-designer qt4-doc qt4-dev-tools python-qt4

and the same for PYQT5,

apt-get install qt5-default

and countless other things. Does anyone know what to do. My latest string (after doing all of the above and more for nearly 2 hours) is this: **couldn't get the code snippet mode to work - don't know why.** MISSING DEPENDENCIES -------------------- Following dependencies are not installed. HPLIP will not work if all REQUIRED dependencies are not installed and some of the HPLIP features will not work if OPTIONAL dependencies are not installed. Package-Name Component Required/Optional pyqt5-dbus gui_qt5 OPTIONAL pyqt5 gui_qt5 REQUIRED Do you want to install these missing dependencies (y=yes*, n=no, q=quit) ? y INSTALL MISSING REQUIRED DEPENDENCIES ------------------------------------- note: Installation of dependencies requires an active internet connection. warning: Missing REQUIRED dependency: pyqt5 (PyQt 5- Qt interface for Python (for Qt version 4.x)) INSTALL MISSING OPTIONAL DEPENDENCIES ------------------------------------- note: Installation of dependencies requires an active internet connection. warning: Missing OPTIONAL dependency for option 'gui_qt5': pyqt5-dbus (PyQt 5 DBus - DBus Support for PyQt5) CHECKING FOR NETWORK CONNECTION ------------------------------- Network connection present. RUNNING PRE-PACKAGE COMMANDS ---------------------------- su -c "dpkg --configure -a" (Pre-depend step 1) su -c "apt-get install -f" (Pre-depend step 2) su -c "apt-get update" (Pre-depend step 3) OK DEPENDENCY AND CONFLICT RESOLUTION ---------------------------------- Running 'su -c "apt-get install --force-yes -y gtk2-engines-pixbuf"' Please wait, this may take several minutes... Running 'su -c "apt-get install --force-yes -y python-pyqt5"' Please wait, this may take several minutes... Running 'su -c "apt-get install --force-yes -y python-dbus.mainloop.pyqt5"' Please wait, this may take several minutes... error: A required dependency 'pyqt4-dbus (PyQt 4 DBus - DBus Support for PyQt4)' is still missing. error: A required dependency 'pyqt4 (PyQt 4- Qt interface for Python (for Qt version 4.x))' is still missing. RUNNING POST-PACKAGE COMMANDS ----------------------------- OK RE-CHECKING DEPENDENCIES ------------------------ error: A required dependency 'pyqt4-dbus (PyQt 4 DBus - DBus Support for PyQt4)' is still missing. error: A required dependency 'pyqt4 (PyQt 4- Qt interface for Python (for Qt version 4.x))' is still missing. error: Installation cannot continue without these dependencies. error: Please manually install this dependency and re-run this installer.```