ubuntu 20.04 btrfs installation

11 Jul 2021

Steps

• Unmount / target and mount the disk on / mnt.

  umount -l /target
  mount /dev/sda2 /mnt
  

• Move all files and folders to a subvolume.

  cd /mnt
  btrfs subvolume create @
  rm swapfile
  mv * @
  

• Unmount /mnt to mount all the devices needed for your system.

  umount /mnt
  mount -o subvol=@ /dev/sda2 /target
  mount /dev/sda2 /target/boot/efi
  mount --bind /proc /target/proc
  mount --bind /dev  /target/dev
  mount --bind /sys  /target/sys
  

• Edit fstab to set the appropriate mount point for the subvolume.

  vi /etc/fstab
  UUID=xxxx / btrfs defaults,noatime,subvol=@ 0 1
  # /swap/swapfile none swap sw 0 0
  

• Update GRUB.

  update-initramfs -u -k all
  grub-install --recheck /dev/sda
  update-grub
  

References

• https://linuxtut.com/en/d34053037468488eacab
• https://askubuntu.com/questions/1204802/where-are-my-btrfs-subvolumes