[unleashkids]

Up to and including Calibre 3.23, all versions Calibre 3.x were installable on Raspberry Pi (on top of Raspbian OS's own Calibre 2.75.1) using the .deb installers here:

http://raspbian.raspberrypi.org/rasp...ain/c/calibre/

But this suddenly changed 11+ days ago with 3.24.2, and 3.25 unfortunately also fails since then

This is what used to work, since 2017:

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

The error is:

The following packages have unmet dependencies:
calibre : Depends: python-pyqt5 (>= 5.10.1+dfsg-2) but 5.10.1+dfsg-1+rpi1 is to be installed
E: Unable to correct problems, you have held broken packages.
Hit:1 http://ppa.launchpad.net/ansible/ansible/ubuntu xenial InRelease
Hit:2 http://raspbian.raspberrypi.org/raspbian stretch InRelease
Hit:3 http://archive.raspberrypi.org/debian stretch InRelease

What else should we try?!

PS does anyone know who is packaging for Raspbian, within http://raspbian.raspberrypi.org, such that we might hopefully contact them too?

CLARIF: this is part of Internet-in-a-Box (https://github.com/iiab, formerly known as http://SchoolServer.org by One Laptop Per Child) that is used broadly by schools in the developing world. Teachers on many continents are Very Eager for a solution (: