This is the problem which failed booting after installation as below Near the end of the installation, default location of grub-installation is /dev/md127p1.
and I changed default to /dev/md/Volume0_0 After that, it doesn't have a problem to boot and no '_' prompot. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1370368 Title: Failed to install Ubuntu 14.04.1 LTS on Dell C6220 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/1370368/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
