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reduce size of root disk/partition

lesson learned: don't do this when using XFS as a filesystem

resize root volume:

  1. boot into resuce / recovery mode
  2. activate / get all volumes:
vgchange -ay

resize volume to 150GB:

lvreduce -L 150G /dev/vg0/root

extend disk / partition / volume

resize to 100% of the remaining space:

pvresize /dev/sda1
lvextend -l +100%FREE -r -v /dev/vg0/home

resize encrypted volume luks

see also cryptsetup

growpart /dev/sda 3 # lsblk (disk partition number)
cryptsetup resize dm_crypt-0 # 
lvextend -l +100%FREE /dev/ubuntu-vg/ubuntu-lv # lvdisplay