[unleashkids]

Originally Posted by norbusan

From where are you pulling calibre-bin?

On a fresh install of the latest Raspbian 48 hours ago on Raspberry Pi, "apt-cache show calibre-bin" definitely shows qtbase-abi-5-10-0 (not 5-11-0) here:

Package: calibre-bin
Status: install ok installed
Priority: optional
Section: text
Installed-Size: 4016
Maintainer: Norbert Preining <preining@debian.org>
Architecture: armhf
Source: calibre
Version: 3.29.0+dfsg-1
Depends: libatomic1 (>= 4.8), libc6 (>= 2.27), libchm1 (>= 0.40), libfontconfig1 (>= 2.12.6), libfreetype6 (>= 2.6), libgcc1 (>= 1:3.5), libgles2, libglib2.0-0 (>= 2.12.0), libicu60 (>= 60.1-1~), libmtp9 (>= 1.1.3), libpodofo0.9.5 (>= 0.9.5-7), libpython2.7 (>= 2.7), libqt5core5a (>= 5.5.0), libqt5dbus5 (>= 5.0.2), libqt5gui5 (>= 5.10.0), libqt5widgets5 (>= 5.0.2), libssl1.1 (>= 1.1.0), libstdc++6 (>= 5.2), libusb-1.0-0 (>= 2:1.0.9), qtbase-abi-5-10-0, zlib1g (>= 1:1.1.4), sip-api-12.5, python2.7
Recommends: calibre (>= 3.29.0+dfsg-1)

This is currently using Debian/testing out of desperation:

echo "deb http://deb.debian.org/debian testing main" >> /etc/apt/sources.list.d/debian-testing.list

But we need to go back to using Raspbian/testing as soon as possible, as was working until May 2018, and has been working intermittently since then:

echo "deb http://raspbian.raspberrypi.org/raspbian/ testing main" > /etc/apt/sources.list.d/rpi-testing.list

REASON: Raspbian/tesing is necessary so it works on the Raspberry Pi Zero W hardware, needed by low-income schools & medical clinics around the planet.

LMK any other strategies I should test, to start bringing this 3-month headache to a close