The Ubuntu installer fails when the system is booted from an on-disk ISO through a Grub2 loopback, instead of the more common DVD or USB install media. The system is able to boot successfully with this approach, but the installer runs into issues. The first seems to be a failure to configure the boot CD for apt updates (there is of course no boot CD).
ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: ubiquity 2.21.17
ProcVersionSignature: Ubuntu 3.19.0-10.10-generic 3.19.2
Uname: Linux 3.19.0-10-generic x86_64
ApportVersion: 2.16.2-0ubuntu4
Architecture: amd64
CasperVersion: 1.356
Date: Sun Apr 5 12:13:18 2015
InstallCmdLine: BOOT_IMAGE=(loop)/casper/vmlinuz.efi boot=casper iso-scan/filename=/Downloads/ubuntu-15.04-beta2-desktop-amd64.iso splash toram
LiveMediaBuild: Ubuntu 15.04 "Vivid Vervet" - Beta amd64 (20150326)
ProcEnviron:
LANGUAGE=en_CA.UTF-8
PATH=(custom, no user)
LANG=en_CA.UTF-8
SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)
Output of
# mount