Resize LVM to use maximum available space
Resize the default Ubuntu LVM root volume to use the maximum available space.
When you set up Ubuntu Server using the installer, Ubuntu sets the default root volume size to 100 GB. I realized this after I had already configured Ubuntu, so I needed to fix this mistake while the server was running.
First, you need to tell LVM to extend the volume to the maximum size available.
sudo lvextend -l +100%FREE /dev/ubuntu-vg/ubuntu-lv
Finally, you need to resize the root file system.
sudo resize2fs /dev/mapper/ubuntu--vg-ubuntu--lv
Your volume has now been resized to use the maximum available space.