I have Ubuntu 16.04 installed on my SSD taking its full size and having LVM enabled. I want to install a second operating system on the same SSD and I am failing to shrink down the partitions that are used by Ubuntu. I resized the logical partition with the following command, followed by its output:

$ sudo lvreduce –resizefs -L 128G /dev/ubuntu-vg/root

fsck from util-linux 2.27.1 /dev/mapper/ubuntu--vg-root: 692451/15056896 files (0.4% non-contiguous), 11307331/60203008 blocks resize2fs 1.42.13 (17-May-2015) Resizing the filesystem on /dev/mapper/ubuntu--vg-root to 33554432 (4k) blocks. The filesystem on /dev/mapper/ubuntu--vg-root is now 33554432 (4k) blocks long.    Size of logical volume ubuntu-vg/root changed from 229.66 GiB (58792 extents) to 128.00 GiB (32768 extents).   Logical volume root successfully resized. 

Now, inside GParted, I see the following screen:

When I try to resize the partition, I get the following error:

GParted 0.25.0 --enable-libparted-dmraid --enable-online-resize  Libparted 3.2 Shrink /dev/sda3 from 237.50 GiB to 135.83 GiB  00:00:00    ( ERROR )  calibrate /dev/sda3  00:00:00    ( SUCCESS )  path: /dev/sda3 (partition) start: 2050048 end: 500117503 size: 498067456 (237.50 GiB) shrink file system  00:00:00    ( ERROR )  lvm pvresize -v --setphysicalvolumesize 142427136K /dev/sda3  00:00:00    ( ERROR )  0 physical volume(s) resized / 1 physical volume(s) not resized Using physical volume(s) on command line. Archiving volume group "ubuntu-vg" metadata (seqno 4). /dev/sda3: Pretending size is 284854272 not 498067456 sectors. Resizing volume "/dev/sda3" to 284854272 sectors. Resizing physical volume /dev/sda3 from 0 to 34772 extents. /dev/sda3: cannot resize to 34772 extents as later ones are allocated.  ======================================== 

Could you please help me resize this thing without losing data? Thanks!