I have tried to upgrade two of my machines from ASCII to Beowulf. It
needed some fiddling with "apt --fix-broken install", trying the
dist-upgrade a couple of times and removing a couple of things. But it
boots and works ok now.

With the exeption of GIMP. That one gives the following error:

$ gimp
gimp: symbol lookup error: /usr/lib/x86_64-linux-gnu/libgegl-0.4.so.0:
undefined symbol: babl_format_with_space
--
Hilsen Harald