lvm

Ubuntu: Extending capacity of an LVM volume group using an existing or new disk

It is common for a virtualized Guest OS base image to have a generic storage capacity.  This capacity can easily be exceeded by production scenarios, performance testing, logging, or even the general cruft of running a machine 24×7. If your VM is using Logical Volume Management (LVM), adding space can be done by following a Ubuntu: Extending capacity of an LVM volume group using an existing or new disk