# Dualbooting NixOS and FreeBSD Out of curiosity, I decided to dual-boot NixOS and FreeBSD on my laptop, sharing one disk. I document the process here for future reference: ## Linux install First, flash a stick with NixOS, then boot into it, wipe your disk, create two partitions, one being boot, the other your main NixOS partition. Then, follow these commands: ```bash sudo su cryptsetup luksFormat /dev/diskname/partition cryptsetup open /dev/diskname/partition crypt mkfs.btrfs -L nixos /dev/mapper/crypt mount /dev/mapper/crypt /mnt btrfs create subvolume /mnt/nix btrfs create subvolume /mnt/home btrfs create subvolume /mnt/persist mkdir /mnt/boot mount /dev/partition # boot partition ``` Then, copy [my nixos flake](https://github.com/bloxx12/nichts) to `/mnt`, you can remove it from there later on. ```bash git clone https://github.com/bloxx12/nichts /mnt ``` In there, change the file system uuids to the correct ones, you can see them using ```bash sudo blkid ``` Then, install NixOS itself: ```bash nixos-install --impure --flake /mnt/nichts# -j 1 --cores 2 ``` Wait for that to finish, then reboot. If your system works, great! if not, redo from the beginning. After that, set up FreeBSD the following way: