Ubuntu GNOME zesty iso boots straight to desktop

[Jeremy Bícha]

I booted today's Ubuntu GNOME amd64 zesty .iso. Instead of loading the screen where you can pick whether to Install or Try, it just loaded Try (in other words, it gave me the Ubuntu GNOME desktop).

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: ubiquity 17.04.3
ProcVersionSignature: Ubuntu 4.9.0-11.12-generic 4.9.0
Uname: Linux 4.9.0-11-generic x86_64
ApportVersion: 2.20.4-0ubuntu1
Architecture: amd64
CasperVersion: 1.380
CurrentDesktop: GNOME
Date: Thu Jan 19 20:54:22 2017
InstallCmdLine: file=/cdrom/preseed/ubuntu-gnome.seed boot=casper initrd=/casper/initrd.lz quiet splash --- maybe-ubiquity
LiveMediaBuild: Ubuntu-GNOME 17.04 "Zesty Zapus" - Alpha amd64 (20170119)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)