I thought I should update readers on this saga and thank people for their input. All is now solved. I now have my 120GB drive in full use. I ran the following commands and show the output.
sudo pvresize /dev/sda5 Physical volume "/dev/sda5" changed 1 physical volume(s) resized / 0 physical volume(s) not resized $ sudo lvresize --resizefs --extents +100%FREE /dev/ubuntu-vg/root Extending logical volume root to 109.55 GiB Logical volume root successfully resized resize2fs 1.42.9 (4-Feb-2014) Filesystem at /dev/mapper/ubuntu--vg-root is mounted on /; on-line resizing required old_desc_blocks = 4, new_desc_blocks = 7 The filesystem on /dev/mapper/ubuntu--vg-root is now 28719104 blocks long.
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