My main problem was that I didn’t have a recent enough backup and had some important work that I didn’t want to lose. I ended up fixing the qubes-qmemman.service start failure by copying /usr/lib64/python3.13/site-packages/xen/lowlevel/xs.cpython-313-x86_64-linux-gnu.so from a fresh install on another computer. This only enabled the domU qubes to start. Xfce remained broken. Using Ctrl+Alt+F2 I was able to trigger a backup by command line. After that I did a fresh install and I increased the root lvm to 60G using this guide before restoring the backup: Guide how to increase `dom0` free disk space to avoid problems with big templates and backups
@augsch thank you for your help, btw!
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