Same problem here when trying to installing Ubuntu 14.04.3 LTS Server x64 using the media created by both Linux Live Usb Creator and UNetbootin. After the error message appeared, I tried to mount the drive manually as suggested by Vladimir and Jav but still no success. The CD- ROM integrity check (available from the installer menu) reports that checksum of ./pool/main/m/maas/python-maas- provisioningserver_1.7.6+bzr3376-0ubuntu2~14.04.1_all.deb is invalid, altough the source ISO image seems to be correct according to SHA1 checksum.
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