The upgrade of my still libsystemd-free desktop PC from Ascii to
Chimaera ~2 weeks ago went so smooth that I forgot to mention it:

    $ apt update && apt dist-upgrade
    $ sed -i\.ascii 's/ascii/chimaera/' /etc/apt/sources.list
    $ apt update && apt upgrade
    (to install: 223 / upgrade: 903)
    $ apt dist-upgrade
    (to install: 655 / upgrade: 628 / remove: 127)

On the way, 'recollgui' threw an error (I didn't even remember, just
rediscovered it in the logs when checking the package counts):

    Unpacking recollgui (1.28.5-1) over (1.24.3-3) ...
    [1mdpkg:[0m error processing archive /tmp/apt-dpkg-install-ks8aVf/20-recollgui_1.28.5-1_amd64.deb (--unpack):
     trying to overwrite '/usr/share/recoll/doc/docbook-xsl.css', which is also in package recollcmd 1.24.3-3

But it was easy to recover:

    $ apt --fix-broken install
    (to install: 40 / upgrade: 49 / remove: 34)
    $ apt dist-upgrade
    (to install: 235 / upgrade: 325 / remove: 65)
    $ reboot
    $ apt autoremove
    (to remove: 140)

Thumbs up and thank you for this great distro!

Florian