pvcreate /dev/sdb
lvmdiskscan -l
vgextend ubuntu-vg /dev/sdb
lvm lvextend -l +100%FREE /dev/mapper/ubuntu--vg-ubuntu--lv
resize2fs -p /dev/mapper/ubuntu--vg-ubuntu--lv
df -h
pvcreate /dev/sdb
lvmdiskscan -l
vgextend ubuntu-vg /dev/sdb
lvm lvextend -l +100%FREE /dev/mapper/ubuntu--vg-ubuntu--lv
resize2fs -p /dev/mapper/ubuntu--vg-ubuntu--lv
df -h