I recently bought a 480GiB SSD drive. I formated it into a swap partition and an Ext4 partition and then installed Ubuntu 15.10 from a CD (and internet). I ticked the box LVM during the installation as I couldn't see any disadvantages to using LVM. The install went fine and the SSD is working even better than I expected.
Having done some reading up on using SSD's I decided to implement Autotrim but then discovered that according to GParted my Ubuntu installation is on an Ext2 virtual partition (/dev/sda2, 446.89GiB)) inside an lvm2 pv partition (/dev/sda5, also 446.89GiB). My swap partition has been removed and in its place a /boot partition (/dev/sda1, 243MiB - 143MiB used) using Ext2 has been created. The /boot partition is not inside the lvm partition. Gparted doesn't give any idea how much of the partition /dev/sda2 is being used.
I have never used LVM before and am worried that I have not installed Ubuntu on the SSD in the best possible way. Could someone offer any advice? I am prepared to do another install, but as I said the installation is working very well for the time being.