not able to install ubuntu, installer crashes.

[conrad]

installer crashes on all linux distros. dvd input/output error halfway through.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubiquity 2.18.7
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic i686
ApportVersion: 2.14.1-0ubuntu3
Architecture: i386
Casper:
 stdin: Not a typewriter
 Generating locales...
   en_US.UTF-8... up-to-date
 Generation complete.
 pwconv: failed to change the mode of /etc/passwd- to 0600
Date: Mon Aug 25 19:05:25 2014
InstallCmdLine: file=/cdrom/boot/ubuntu/1404/preseed/ubuntu.seed boot=casper live-media-path=/boot/ubuntu/1404/casper ignore_uuid only-ubiquity initrd=/boot/ubuntu/1404/casper/initrd.lz quiet splash -- priority=low
ProcEnviron:
 TERM=linux
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Brian Murray (brian-murray)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. While we appreciate the difficulties you are facing, it would appear that the CD image (ISO file) you downloaded could be corrupt. There is an easy way to verify the integrity of the Ubuntu ISO files you download. Could you please visit https://help.ubuntu.com/community/HowToMD5SUM follow the instructions and report back as to whether or not the MD5SUM verified? Thanks in advance.