32-bit installer images are no longer provided for Ubuntu Desktop. The Ubuntu Desktop now uses GNOME instead of Unity. On supported systems, Wayland is now the default display server. The older display server is still available: just choose Ubuntu on Xorg from the cog on the log in screen. GDM has replaced LightDM as the default display manager. The login screen now uses virtual terminal 1 instead of virtual terminal…
I'm putting a lot of hope into 18.04. Been using Ubuntu for over a decade now and my happiness with it has been steadily decreasing. Mostly at this point due to very laggy graphics performance (whether using OSS or closed drivers) on a system that should be very fast.
If 18.04 isn't awesome I'm moving on to something else. So I'm glad to see they're breaking some eggs with 17.10!