Ubuntu vivid bootable USB doesn't boot in non-UEFI mode

[Pavak Paul]

Ubuntu vivid (daily builds) doesn't boot in non-UEFI/legacy mode. It shows some error in cli but never boots. But if the same USB drive is booted in UEFI mode in the same computer, it works.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: syslinux 3:6.03+dfsg-5ubuntu1
ProcVersionSignature: Ubuntu 3.19.0-12.12-generic 3.19.3
Uname: Linux 3.19.0-12-generic x86_64
ApportVersion: 2.17-0ubuntu1
Architecture: amd64
CasperVersion: 1.358
CurrentDesktop: Unity
Date: Sat Apr 4 19:38:42 2015
LiveMediaBuild: Ubuntu 15.04 "Vivid Vervet" - Beta amd64 (20150404)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: syslinux
UpgradeStatus: No upgrade log present (probably fresh install)

[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/1440400

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.