This error is not isolated to installs on hard drives with Windows installed, nor does it have anything to do with the drive being an external drive. I received Error 21 on an empty disk installed in my computer. It failed on an Asus P5B systemboard running a Core2 Duo E-6600 processor. I also attempted to install Ubuntu on another clone Asus P5LD2-Deluxe and I couldn't even boot to the cd. Ubuntu installed fine on my Dell GX110 that is 8 years old.
-- Grub - Error 21 returned https://bugs.launchpad.net/bugs/8978 You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
