Extend the LVM space

Resize partition:

sudo cfdisk

Select the physical volume and resize and write before you exit.

Extend PV physical volume:

sudo pvresize /dev/sda3

Find the logical volume (LV Path):

sudo lvdisplay

Extend logical volume:

sudo lvextend -l +100%FREE /dev/ubuntu-vg/ubuntu-lv

Get the name your LVM path: (e.g. /dev/mapper/ubuntu--vg-ubuntu--lv)

df -h

Resize the LVM using the path from above:

sudo resize2fs /dev/mapper/ubuntu--vg-ubuntu--lv

Check the volume sizes:

df -h