How to expand an existing Linux drive?

Question

linux

Good day to all. There is a Windows virtualizer and Ubuntu 14.04.5 LTS available
. data occupied the entire disk. I don't know how the car was made.
I increased the space through the virtualizer

But the system sees only 30 end-to-end


Before that, I created a test machine and the virtualizer automatically expanded the disk itself.
How to expand a disk without losing data?

Answer 1

This should help

Answer 2

man resize2fs