#!/bin/sh
# inspect GUID Partition Table
sudo gdisk -l /dev/sda
sudo blkid
# list the LVM LVs
ls /dev/mapper/
# check the size of the VG to determine how small to shrink the root FS, which will be using the entire VG at this point
sudo vgdisplay
# I'm working in an 8GB VM so am using very small LV sizes. I'd recommend minimum 8GB for root FS, 12GB if /var/ is not in
# a separate 8GB LV
sudo lvresize -L 4G -r /dev/mapper/kubuntu--vg-root
# create an LV for /home/
sudo lvcreate -L 1G kubuntu-vg -n home
# create the file-system
sudo mkfs.ext4 /dev/kubuntu-vg/home
# mount the newly installed root FS
sudo mount /dev/mapper/kubuntu--vg-root /target
# add the /home/ LV to the FS table
echo "/dev/mapper/kubuntu--vg-home /home ext4 defaults 0 2" | sudo tee -a /target/etc/fstab
cat /target/etc/fstab
# determine which files and directories (all of them!) need moving to the new /home/
ls -al /target/home/
# mount the new home FS somewhere
sudo mount /dev/mapper/kubuntu--vg-home  /mnt
# move everything under the root FS's /home/ to the new home FS
sudo mv /target/home/* /target/home/,[^.]* /mnt/
# check
ls -la /target/home/
# clean up
sudo umount /mnt /target
# reboot and enjoy