Ubuntu Linux VM on Hyper-V – Expand Virtual disk to full size

Ubuntu initial setup does not do expand the virtual disk image to it’s full size. You should to this after setting up Ubuntu or when expanding the size of the VHD file.

First off, check where is ubuntu located (/dev/sdxY) and the actual drive space available with:

sudo lsblk -o NAME,FSTYPE,SIZE,MOUNTPOINT,LABEL

To expand, run:

sudo pvs

Resize with:

sudo pvresize /dev/sda1

Get mapper for drive with:

df -h

Expand the filesystem with:

sudo lvextend -r -l +100%FREE /dev/mapper/ubuntu--vg-root

Run the inital command again and check if it’s done.