[mdlug] Mythbuntu CD would not boot on a X64 system

[Jeff Hanson]

I'm working on a dual-boot GPT/non-EFI (BIOS) system but haven't had time
to complete it yet.  From what I've read GRUB2 requires a small partition
(1MB or less) for itself but this doesn't get created with the Ubuntu
installer.  In my situation the target system is using RAID 1 with both and
Win7 requires Dynamic Volumes for RAID and these use GPT only.  I haven't
had time to finish the install yet so I don't know if this will work or not.


On Sun, Nov 4, 2012 at 3:27 PM, R KANNAN <rk111810 at gmail.com> wrote:

> On Sat, Nov 3, 2012 at 7:59 PM, R KANNAN <rk111810 at gmail.com> wrote:
>
> > It looks like the original disk was partitioned with MBR record. But for
> > soie reason my Ubuntu installation thought it was GPT partition and so
> did
> > not overwrite the MBR. Is there a way to force Mythbuntu 12.04 to write
> the
> > MBR after the installation is complete. Do I need to run grub-update or
> > something like that?
> >
>
> > On Sat, Nov 3, 2012 at 11:46 AM, R KANNAN <rk111810 at gmail.com> wrote:
> >
> >> Never mind. I could boot with the install CD after using kernel option
> >> 'nomodeset'.
> >>
> >> I could create partitions as needed and install but the MBR did not get
> >> updated. The system now boots up in Windows 7 (with reduced  disk
> space).
> >> Maybe HP has a security option whereby it does not allow MBR to be
> updated.
> >> Need to look into it.
> >>
> >> On Fri, Nov 2, 2012 at 11:29 PM, R KANNAN <rk111810 at gmail.com> wrote:
> >>
> >>> Hi,
> >>>
> >>> I have a new HP desktop with Intel  i7-2660 processor and windows 7.
> >>>
> >>> I downloaded an burned  a Mythbuntu 12.04 X64 iso. I also checked the
> >>> md5sum on the downloaded iso and found it matched with the published
> value.
> >>>
> >>> When I tried boot the system up with the CD. It flashed the message
> >>>
> >>> Error: "Prefix is not set"
> >>>
> >>> but came with the following options menu
> >>>
> >>> Try Mythbuntu without installing
> >>> Install Mythbuntu
> >>> Check disk for defects
> >>>
> >>> When I tried either the first or second, the drive spins for a while,
> >>> then it starts making sounds as if it is reading the disk and two
> >>> horizontal lines of green/blue dots appears on the screen and the drive
> >>> goes silent.
> >>>
> >>> I tried burning the image on another CD but with the same results.
> >>> Should I be changing some options or use grub on the command line to
> debug?
> >>>
> >>> Thanks
> >>
> >>
> >>
> > It looks like the HP Recovery manager restores the MBR wiping the GRUB2
> out after installation. As suggested by some of the websites, I even
> removed the HP recovery partition after making backup disks. That did not
> seem to help either. After a fresh install of Ubuntu 12.04, it keeps
> booting into windows instead of bringing up the GRUB boor menu :-(
>
> Any other ideas?
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