Proxmox increase disk and resize existing filesystem

proxmox_increase_filesystem_from_existing_disk.sh

1st step: increase/resize VM disk from Proxmox GUI console

2nd step: Extend physical drive partition
sudo fdisk -l (check free space)
growpart /dev/sda 3 (Extend physical drive partition )
pvdisplay (See phisical drive)
sudo pvresize /dev/sda3 (Instruct LVM that disk size has changed)
pvdisplay (check physical drive if has changed) 

3rd step: Extend Logical volume
lvdisplay (View starting LV)
sudo lvextend -l +100%FREE /dev/ubuntu-vg/ubuntu-lv (Resize LV)
lvdisplay (View changed LV)

4th step: Resize Filesystem
resize2fs /dev/ubuntu-vg/ubuntu-lv (Resize FS)
fdisk -l (Confirm results)