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Make a new partition from the disk, say sda.
```
sudo fdisk /dev/sda
```
Press “Enter” button for default options like new partition (n), first sector, last sector
Press w to write the changes
Create physical volume(PV) and add it to the existing volume group(VG) with the below commands
```
sudo pvcreate /dev/sda4    #its the 4th partition of the disk at that time
```
Check created PV
```
sudo pvs
```
Now extend the VG size from the created PV with below command
```
sudo vgextend ubuntu-vg /dev/sda4
```
Check the new space in volume group
```
sudo vgs
```
Now extend the existing lvm with total available space in the volume group (VG)
```
sudo lvextend -l +100%FREE /dev/ubuntu-vg/ubuntu-lv
```
To implement the above size to the lvm run below command
```
sudo resize2fs /dev/ubuntu-vg/ubuntu-lv
```
Now finally check the new size of lvm
```
df -hT
```