Grub2 also ignores request to not install boot loader.

I installed lucid 10.04 beta 1 to external USB (/sdb). Selected 'Advanced' and 
deselected 'Install boot loader' (as I use grub2 with my karmic install to boot 
into lucid). It prompted me - are you sure etc...
It then installed a boot loader anyway on the internal HDD extended partition 
/sda4.

fdisk -l  showed before:
/dev/sda4         123,829,020   146,834,099    23,005,080   5 Extended

and after:
/dev/sda4         123,829,082   146,834,099    23,005,018   5 Extended

Running boot info script shows: "Unknown BootLoader  on sda4"

-- 
[karmic] grub re-writes boot sector on wrong drive on fresh install
https://bugs.launchpad.net/bugs/414996
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Status in Mythbuntu, Ubuntu derivative focused upon MythTV: Invalid
Status in “grub2” package in Ubuntu: Confirmed

Bug description:
I attempted to install mythbuntu karmic/9.10 alpha 4 to a USB drive.   Using a 
laptop with an IDE drive containing Windows XP, I booted from the ISO image 
CD-ROM and went through the installation, selecting manual partitioning, and 
creating a single EXT4 root filesystem on a USB drive.   The installation 
proceeded through the complete install to the USB key until instructed to 
reboot.

I re-booted the laptop with the USB key inserted, and was presented with the 
message "No bootable partition in table".  Then, removing the USB key and 
booting from the laptop IDE drive (which should not have been touched by the 
mythbuntu install) I get the message "GRUB loading.  Welcome to GRUB!  Entering 
rescue mode... error: no such disk"  followed by the "grub rescue>" prompt.  

I examined the laptop hard drive with a partition editor, and the Windows 
partition is still intact....  but it looks like the boot sector has been 
re-written mistakenly.

Now I have two problems.....
1) how do I get Windows on my laptop to boot again....  I need my work data!
2) how do I make my mythbuntu USB front-end install bootable?



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