* Hi !
beginner question here. I've installed nixos within virtualbox, made a few changes to configuration.nix and eventually did a `nixos-rebuild switch`.
Unfortunately, the build failed and after a reboot, grub cannot seem to find the kernel at all. Whatever the configuration I select, it always fail to find a kernel :-(
1. is this normal ? the latest modification wasn't about the kernel nor grub so I was quite surprised it failed like this.
2. when a `nixos-rebuild switch` failed, does it automatically rollback so next reboot fallback on the previous working configuration ?