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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1482838 Title: I was trying to install Ubuntu desktop, installer crashed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1482838/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
