Check disk for defects fail on MD5 checksum for A3 quantal i386 Server

[Para Siva]

Running the 'Check disk for defects' fails with 'The ./install/netboot/ubuntu-installer/i386/pxelinux.cfg/default file failed the MD5 checksum verification. Your CD-ROM or this file may have been corrupted.' error message.

Constantly reproducible, on quantal-server-i386 downloaded from
http://cdimage.ubuntu.com/ubuntu-server/daily/20120724.5/quantal-server-i386.iso which is seemingly identical to
http://cdimage.ubuntu.com/ubuntu-server/daily/20120725.4/quantal-server-i386.iso

The installation media was created on a USB using Startup Disk Creator.

[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/1029407

[Brian Murray (brian-murray)]

Is this still an issue with a later daily build of quantal? If so can you manually check the md5sum of the file on the USB disk and add it to the bug report? Thanks in advance.

[Para Siva (psivaa)]

This is still occurring in the latest image, with buildid as given in
Ubuntu-Server 12.10 "Quantal Quetzal" - Alpha i386 (20120813)

Upon trying to verify the md5sum of ./install/netboot/ubuntu-installer/i386/pxelinux.cfg/default, it was found that the file is not present at all in the image. Hope this narrows down the issue.

Thanks