During installation of Ubuntu Server, a common issue arises where your hard drive's space is not fully available for use.
# View your disk drives
sudo -s lvm
# Change the logical volume filesystem path if required
sudo lvextend -l +100%FREE /dev/ubuntu-vg/ubuntu-lv
#exit lvextend
exit
# Resize file system to use the new available space in the logical volume
sudo resize2fs /dev/ubuntu-vg/ubuntu-lv
## Verify new available space
df -h
# Example output of a 2TB drive where 25% is used
# Filesystem Size Used Avail Use% Mounted on
# /dev/ubuntu-vg/ubuntu-lv 2000G 500G 1500G 25% /