Recovery attempt

[nixos@nixos:~]$ sudo -i

[root@nixos:~]# lsblk -f
NAME   FSTYPE   FSVER            LABEL                        UUID                                 FSAVAIL FSUSE% MOUNTPOINTS
loop0  squashfs 4.0                                                                                      0   100% /nix/.ro-store
sda
├─sda1 vfat     FAT32                                         C8DF-1D46
└─sda2 ext4     1.0                                           509efae4-ec18-4057-93d4-a0bf08037f85
sdb    iso9660  Joliet Extension nixos-graphical-25.05-x86_64 1980-01-01-00-00-00-00
├─sdb1 iso9660  Joliet Extension nixos-graphical-25.05-x86_64 1980-01-01-00-00-00-00                     0   100% /iso
└─sdb2 vfat     FAT12            EFIBOOT                      1234-5678

[root@nixos:~]# mount /dev/sda2 /mnt

[root@nixos:~]# mount /dev/sda1 /mnt/boot

[root@nixos:~]# nixos-enter --root /mnt
setting up /etc...

[root@nixos:/]# nixos-rebuild boot --install-bootloader --show-trace --flake '/home/klucas/.nix-config'
warning: Git tree '/home/klucas/.nix-config' is dirty
building the system configuration...
warning: Git tree '/home/klucas/.nix-config' is dirty
Running in a chroot, enabling --graceful.
Copied "/nix/store/f8plklbbq3gwkq1wfq89i3f4wy8rabzn-systemd-258/lib/systemd/boot/efi/systemd-bootx64.efi" to "/boot/EFI/systemd/systemd-bootx64.efi".
Copied "/nix/store/f8plklbbq3gwkq1wfq89i3f4wy8rabzn-systemd-258/lib/systemd/boot/efi/systemd-bootx64.efi" to "/boot/EFI/BOOT/BOOTX64.EFI".
⚠  Mount point '/boot' which backs the random seed file is world accessible, which is a security hole!  ⚠
⚠ Random seed file '/boot/loader/random-seed' is world accessible, which is a security hole! ⚠
Random seed file /boot/loader/random-seed successfully refreshed (32 bytes).
Created EFI boot entry "Linux Boot Manager".
Done. The new configuration is /nix/store/zc630d9sshlhp3ppppx39b32zhqn0yqi-nixos-system-nixos-25.11.20251108.b6a8526

[root@nixos:/]#