Boot from an Ubuntu LiveCD

Locate the volume group that you wish to shrink ubuntu@ubuntu:~$ sudo lvmdiskscan

ubuntu@ubuntu:/dev$ sudo lvmdiskscan /dev/ram0 [ 64.00 MiB] /dev/loop0 [ 1.41 GiB] /dev/ubuntu-vg/root [ 460.32 GiB]

Issue the following command to shrink the file system and the volume ubuntu@ubuntu:~$ sudo lvreduce –resizefs –size -230G /dev/ubuntu-vg/root

Reboot