In Ubuntu 16.04.1, booting a live USB and typing mount reveals that / is mounted as an OverlayFS with a squashfs filesystem as the lower directory and a ramdisk as the upper directory.
However, booting to a Ubuntu 16.04.2 live USB and typing mount shows that / is mounted as an aufs instead of an overlayfs.
Ubuntu 17.04 and any later versions seem to use aufs as well, while 16.04.1 and earlier versions all use overlayfs.
Why did this change occur between the Ubuntu 16.04.1 and 16.04.2 CD images? Is this related to an update to casper? It seems like a weird change to have been made, as I thought Ubuntu 16.04 was supposed to have been feature-frozen.
