I was trying to install Ubuntu desktop, installer crashed

[DanielVasanthan]

During the initial stage, ubuntu installer crashed.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubiquity 2.18.8.9
ProcVersionSignature: Ubuntu 3.19.0-25.26~14.04.1-generic 3.19.8-ckt2
Uname: Linux 3.19.0-25-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.11
Architecture: amd64
CasperVersion: 1.340.2
Date: Sat Aug 8 03:19:26 2015
InstallCmdLine: file=/cdrom/preseed/ubuntu.seed boot=casper cdrom-detect/try-usb=true noprompt floppy.allowed_drive_mask=0 ignore_uuid initrd=/casper/initrd.lz quiet splash -- BOOT_IMAGE=/casper/vmlinuz.efi
LiveMediaBuild: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Ubuntu Foundations Team Bug Bot (crichton)]

Exception during installation:
Aug 8 07:19:16 ubuntu /plugininstall.py: Traceback (most recent call last):
Aug 8 07:19:16 ubuntu /plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1770, in <module>
Aug 8 07:19:16 ubuntu /plugininstall.py: install.run()
Aug 8 07:19:16 ubuntu /plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 78, in wrapper
Aug 8 07:19:16 ubuntu /plugininstall.py: func(self)
Aug 8 07:19:16 ubuntu /plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 237, in run
Aug 8 07:19:16 ubuntu /plugininstall.py: self.install_extras()
Aug 8 07:19:16 ubuntu /plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1244, in install_extras
Aug 8 07:19:16 ubuntu /plugininstall.py: self.do_install(install_misc.query_recorded_installed())
Aug 8 07:19:16 ubuntu /plugininstall.py: File "/usr/lib/ubiquity/ubiquity/install_misc.py", line 912, in do_install
Aug 8 07:19:16 ubuntu /plugininstall.py: mark_install(cache, pkg)
Aug 8 07:19:16 ubuntu /plugininstall.py: File "/usr/lib/ubiquity/ubiquity/install_misc.py", line 527, in mark_install
Aug 8 07:19:16 ubuntu /plugininstall.py: "Unable to install '%s' due to conflicts." % pkg)
Aug 8 07:19:16 ubuntu /plugininstall.py: ubiquity.install_misc.InstallStepError: Unable to install 'udev' due to conflicts.
Aug 8 07:19:16 ubuntu /plugininstall.py:

[Brian Murray (brian-murray)]

Looking at the log file for your installation it appears that the disk, likely a USB stick, was not erased before putting 14.04 on it. As we can see here there is information about vivid still on it, which would surely cause the installation failure.

Aug 8 07:17:37 ubuntu apt-setup: Source list entries for this disc are:
Aug 8 07:17:37 ubuntu apt-setup: deb cdrom:[Ubuntu 14.04.3 LTS _Trusty Tahr_ - Beta amd64 (20150805)]/ trusty main restricted
Aug 8 07:17:37 ubuntu apt-setup: deb cdrom:[Ubuntu 14.04.3 LTS _Trusty Tahr_ - Beta amd64 (20150805)]/ vivid main restricted
Aug 8 07:17:37 ubuntu apt-setup: Repeat this process for the rest of the CDs in your set.
Aug 8 07:17:38 ubuntu in-target: Ign cdrom://Ubuntu 14.04.3 LTS _Trusty Tahr_ - Beta amd64 (20150805) trusty InRelease
Aug 8 07:17:38 ubuntu in-target: Ign cdrom://Ubuntu 14.04.3 LTS _Trusty Tahr_ - Beta amd64 (20150805) vivid InRelease
Aug 8 07:17:38 ubuntu in-target: Ign cdrom://Ubuntu 14.04.3 LTS _Trusty Tahr_ - Beta amd64 (20150805) trusty/main Translation-en_US
Aug 8 07:17:38 ubuntu in-target: Ign cdrom://Ubuntu 14.04.3 LTS _Trusty Tahr_ - Beta amd64 (20150805) trusty/main Translation-en
Aug 8 07:17:38 ubuntu in-target: Ign cdrom://Ubuntu 14.04.3 LTS _Trusty Tahr_ - Beta amd64 (20150805) trusty/restricted Translation-en_US
Aug 8 07:17:38 ubuntu in-target: Ign cdrom://Ubuntu 14.04.3 LTS _Trusty Tahr_ - Beta amd64 (20150805) trusty/restricted Translation-en
Aug 8 07:17:38 ubuntu in-target: Ign cdrom://Ubuntu 14.04.3 LTS _Trusty Tahr_ - Beta amd64 (20150805) vivid/main Translation-en_US
Aug 8 07:17:38 ubuntu in-target: Ign cdrom://Ubuntu 14.04.3 LTS _Trusty Tahr_ - Beta amd64 (20150805) vivid/main Translation-en
Aug 8 07:17:38 ubuntu in-target: Ign cdrom://Ubuntu 14.04.3 LTS _Trusty Tahr_ - Beta amd64 (20150805) vivid/restricted Translation-en_US
Aug 8 07:17:38 ubuntu in-target: Ign cdrom://Ubuntu 14.04.3 LTS _Trusty Tahr_ - Beta amd64 (20150805) vivid/restricted Translation-en