Hi,
> $ guix environment --ad-hoc xpra --pure -- xpra start :100 > 2021-12-29 09:44:20,712 Warning: cannot load cython bencode > module: No module named 'xpra.net.bencode.cython_bencode' > Warning: using '/run/user/1000' as XDG_RUNTIME_DIR > xpra initialization error: > start is not supported by this local installation it’s also broken for me and I couldn’t come up with an easy fix, so I reverted the upgrade to 4.3 for now. If you `guix pull` it should be back to 4.2.2. You definitely can use inferiors to work around something like this. You could also run a known-good version via `guix shell --commit=xxx`. Cheers, Lars