You expanded your VM disk from 120G to 140G, but lsblk still shows the old size:

NAME                        MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINTS
sda                           8:0    0   140G  0 disk
├─sda1                        8:1    0     1G  0 part  /boot/efi
├─sda2                        8:2    0     2G  0 part  /boot
└─sda3                        8:3    0 116.9G  0 part
  └─dm_crypt-0              253:0    0 116.9G  0 crypt
    └─ubuntu--vg-ubuntu--lv 253:1    0 116.9G  0 lvm   /

The disk is bigger but nothing downstream knows about it. Here's how to propagate the growth through every layer.

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