$ free -h
              total        used        free      shared  buff/cache   available
Mem:           3.3G        196M        2.9G        5.3M        239M        2.9G
Swap:          979M          0B        979M
$ cat /proc/swaps
Filename                Type        Size    Used    Priority
/dev/dm-1                               partition   1003516 0   -2
$ ls /dev/mapper/ -la
total 0
drwxr-xr-x  2 root root     120 Feb 23 16:47 .
drwxr-xr-x 22 root root    4260 Feb 23 16:47 ..
crw-------  1 root root 10, 236 Feb 23 16:47 control
lrwxrwxrwx  1 root root       7 Feb 23 16:52 lubuntu--vg-home -> ../dm-2
lrwxrwxrwx  1 root root       7 Feb 23 16:52 lubuntu--vg-root -> ../dm-0
lrwxrwxrwx  1 root root       7 Feb 23 16:52 lubuntu--vg-swap -> ../dm-1

$ sudo mkdir /mnt/home
$ sudo mount /dev/mapper/lubuntu--vg-home  /mnt/home/
$ sudo cp -r /home/* /mnt/home/
$ sudo mv home/ home-orig
$ sudo mkdir /home

$ cat /etc/fstab
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
/dev/mapper/lubuntu--vg-root /               ext4    errors=remount-ro 0       1
# /boot/efi was on /dev/sda1 during installation
UUID=0C1E-EE69  /boot/efi       vfat    umask=0077      0       1
/dev/mapper/lubuntu--vg-swap none            swap    sw              0       0
# my change:
/dev/mapper/lubuntu--vg-home /home               ext4    defaults 0       2