Ubuntu disk partition extension under LVM:

1/ extend the LVM volume (cheated with gparted but parted would work fine, this is the container partition for the “Volume Group”.

2/ Next launch LVM and use “lvdisplay” to print the current output, mine was a container group with a single logical volume named “root”

3/ Now I know the location and name of the LV I can issue the following command to expand it into the available free space created in step 1:

lvextend -l +100%FREE /dev/Container1/root

4/ Finally exit lvm and expand the file system to fill the LV:

sudo resize2fs /dev/Container1/root