A recent minecraft and/or linux update screwed the pooch.
The Minecraft.deb file from minecraft.net referred to libpango, which doesn’t exist on Debian testing at the moment. The correct library is libpangox. The solution, referred to here, is to unpack Mojang’s deb, edit the control file, rebuild the deb and install it.
Here’s what worked for me:
remove the dead package
sudo apt --fix-broken install
sudo apt-get remove minecraft-launcher
installing the pango lib
sudo apt-get install libpangox-1.0-0
#make a place to work mkdir minecraft-launcher #unpack the .deb into the workdir dpkg-deb -R Minecraft.deb minecraft-launcher #edit the control file vi minecraft-launcher/DEBIAN/control #replace the existing pango entry with something like #"libpangox-1.0-0 (>= 0.0.2)" #save, exit editor
reassembling the package
nice -19 dpkg-deb -b minecraft-launcher
installing the package
sudo dpkg --install ./minecraft-launcher.deb