I think the problem occurs when apt fails to configure additional packages to be installed from the cdrom - in my case I'm using the usb installer.
my /var/log/syslog says: grep: /target/etc/sources.list : No such file or directory Exception during installation Traceback(most recent call last): ... InstallStepError: AptSetup failed with code 127 -- Installer crash using USB on netbook https://bugs.launchpad.net/bugs/660569 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs