Bionic ISO slow to boot

Booting from Xubuntu iso in grub, or booting from iso on usb it's very slow to reach desktop.

Also seeing the same behaviour with the Ubuntu iso.

Makes no difference if I boot on hardware or with a vm.

Takes somewhere around 38 seconds to reach the Try/Install dialogue.

Noted that console when showing gave me 'A start job is running for Ubuntu live cd installer' which eventually times out around 90s or so.

systemd-analyze blame once desktop had been reached gave these 2 long times

    1min 36.693s ubiquity.service
          6.931s NetworkManager-wait-online.service

attached journalctl

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 17.10.10
ProcVersionSignature: Ubuntu 4.13.0-17.20-generic 4.13.8
Uname: Linux 4.13.0-17-generic x86_64
ApportVersion: 2.20.8-0ubuntu5
Architecture: amd64
CasperVersion: 1.388
CurrentDesktop: XFCE
Date: Thu Dec 28 09:22:18 2017
LiveMediaBuild: Xubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20171227)
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)