Ruined Plex on Update to the new PlexPass release (0.9.17.2) - Help! :(

Hey all,

I got a notification that the new PlexPass release of Plex was out but I had to manually update. So I downloaded the .deb package and run sudo dpkg -i .deb. Following this, my plexmediaserver would refuse to start.

I completely uninstalled Plex (using the guide on the Plex website), rebooted, and reinstalled. I still can't get it to work!!

I've done a fresh install and not touched anything. No errors are given during the install process, but when I visit localhost:32400/web, nothing appears. No log files are being generated, and the plexmediaserver service isn't starting.
There's also no plex user or group being created.

Here's the install log:

jjb89@JB:~/Downloads$ sudo dpkg -i plexmediaserver_0.9.17.2.2159-2bd156c_amd64.deb
[sudo] password for jjb89: 
Selecting previously unselected package plexmediaserver.
(Reading database ... 218456 files and directories currently installed.)
Preparing to unpack plexmediaserver_0.9.17.2.2159-2bd156c_amd64.deb ...
Unpacking plexmediaserver (0.9.17.2.2159-2bd156c) ...
Setting up plexmediaserver (0.9.17.2.2159-2bd156c) ...
Processing triggers for gnome-menus (3.10.1-0ubuntu2) ...
Processing triggers for desktop-file-utils (0.22-1ubuntu1) ...
Processing triggers for mime-support (3.54ubuntu1.1) ...
Processing triggers for ureadahead (0.100.0-16) ...
ureadahead will be reprofiled on next reboot
jjb89@JB:~/Downloads$ 

This is the upstart file generated by the boot up process (I deleted the previous boot file before reinstalling).

# plexpms - service job file

description "Plex Media Server"
author "https://plex.tv/"

# Start the media server after network and filesystem
# Otherwise this lead to a unresponsive server
start on filesystem and net-device-up IFACE!=lo

# When to stop the service
stop on runlevel [016]

# Automatically restart process if crashed
respawn

# What to execute
script
    if [ -r /etc/default/plexmediaserver ]; then
        . /etc/default/plexmediaserver
    fi 
    start-stop-daemon --start -c $PLEX_MEDIA_SERVER_USER --exec /usr/sbin/start_pms
end script

I'm on Ubuntu 14.04 and I'm a linux novice so please bear with me :) Thanks!