Hi all, Apparently It’s my stupid mistake. Forgot to use “sudo” when running guix system before time-machine. Works: sudo guix time-machine --commit=v1.3.0 –-channels=./channels.scm -- system vm config.scm Segfaults: guix time-machine --commit=v1.3.0 –-channels=./channels.scm -- system vm config.scm My guess it’s a permission thing although not completely sure which. The user was added kvm group for read/write access following the manual. I’ll try to look up what’s exactly wrong with my setup. Sorry for taking your time. Once again thank you guys for making GUIX happen!!! – Best Regards, Ignas Lapėnas