sudo mkfs.ext4 -F /dev/sda3

sudo mkdir -p /var/lib/libvirt/images
sudo mount /dev/sda3 /var/lib/libvirt/images

sudo chown -R libvirt-qemu:libvirt-qemu /var/lib/libvirt/images
sudo chmod 755 /var/lib/libvirt/images

echo '/dev/sda3 /var/lib/libvirt/images ext4 defaults 0 2' | sudo tee -a /etc/fstab

lsblk | grep sda3

sudo lvextend -L 500G /dev/ubuntu-vg/ubuntu-lv

sudo resize2fs /dev/ubuntu-vg/ubuntu-lv

df -h /