LiveUSB 14.04 Server Installer Requires CD

[Cerin]

The current ubuntu-14.04.2-server-amd64.iso can only be installed from CD on machines that have a CD/DVD drive, even when attempting to install from a USB drive.

Steps to reproduce:

1. Use Startup Disk Creator or Unetbootin to write ubuntu-14.04.2-server-amd64.iso to a USB drive of 2GB or larger.
2. Use USB drive to boot on a computer containing an empty CD/DVD drive.
3. Select "Install Ubuntu Server" from the installer's menu.
4. Follow installation instructions until you receive an error complaining that CD cannot be loaded.

Expected result:

Regardless of whether or not you have a disk in the CD/DVD drive, the LiveUSB installer should not require a CD in order to install.

Actual result:

The LiveUSB installer refuses to continue installation until an Ubuntu installation CD is placed in the CD/DVD ROM drive.

Additional Notes:

To ensure the problem wasn't caused by a bug in the tool used to create the LiveUSB, I tried creating the LiveUSB through several different methods documented here https://help.ubuntu.com/community/Installation/FromUSBStick, specifically with Startup Disk Creator, Unetbootin and mkusb. As expected, the result was the same.

The machine this was tested on, an Asus RS100-E7/PI2, has a working 10/100/1000 Mbps Internet connection, which I confirmed works by booting into the "Try Ubuntu" option and accessing webpages.

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1444464/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1444464