hplip-3.17.6.run cannot find installed packages on Mint 18.1

[Anton Golovanov]

The bug seems similar to https://bugs.launchpad.net/hplip/+bug/1690408 which should have been fixed in 3.17.6 according to the release notes.

First, hplip-3.17.6.run still does not detect the OS and sets it to 'Debian stretch/sid' by default.

After I selected Linux Mint 18.1 as an OS, it says that the following dependencies are missing:

python3-notify2 gui_qt5 OPTIONAL
python3-pyqt4-dbus gui_qt4 OPTIONAL
python3-pyqt4 gui_qt4 REQUIRED
python3-pyqt5-dbus gui_qt5 OPTIONAL
python3-pyqt5 gui_qt5 REQUIRED
python3-dbus fax REQUIRED
python3-pil scan OPTIONAL
python3-reportlab fax OPTIONAL

However, packages python3-pyqt4, python3-pyqt5, and python3-dbus are already installed on my system:

> apt list python3-pyqt4
Listing... Done
python3-pyqt4/xenial,now 4.11.4+dfsg-1build4 amd64 [installed]

> apt list python3-pyqt5
Listing... Done
python3-pyqt5/xenial,now 5.5.1+dfsg-3ubuntu4 amd64 [installed]

> apt list python3-dbus
Listing... Done
python3-dbus/xenial,now 1.2.0-3 amd64 [installed]

The installation of these dependencies in the script fails. If I choose not to install them instead, I get:
error: Installation can not continue because all REQUIRED dependencies are not installed.

[Anton Golovanov (agolovanov)]

The issue was caused by not using /usr/bin/python as default python.