Hi,
was bitten by this as well. The whonix repos must have been in a strange state yesterday (Sep 17), and a dist-upgrade removed too much stuff (with essentially
the symptoms you describe).
I bit the bullet and just reinstalled the whonix templates, followed by
apt update/dist-upgrade/autoremove and today everything behaved as expected.
It would be great though if it were possible to avoid these 'flaky' states of
the whonix repos ..
Best,
Stefan