Hi Antoine,
Thanks for pointing out the error in my approach for asking help from other uml users in the forum. I am using Ubuntu 10.04 as my host OS , linux-2.6.24-rc7 as my kernel image for uml and Ubuntu-Maverick root filesystem(ext4 types) as rootfs for uml.

Please help me in my efforts and since this is my first post to any forums/threads please excuse me for any lack of details provided.

Regards,
Sarthak Dash

On Wed, Feb 16, 2011 at 12:45 AM, Antoine Martin <antoine@nagafix.co.uk> wrote:
Hi Sarthak,

You're not saying which kernel you are using or which filesystem... which makes it hard for people to help you.
My guess is that you're trying to mount an ext3/ext4 filesystem on an older kernel that does not support its features.

Cheers
Antoine




On 14/02/11 05:09, sarthak dash wrote:
Hey folks,

I just tried to install User Mode Linux in my laptop for a research
project in order to test a kernel module but couldn't succeed. The error
that I keep on getting is :-

EXT3-fs: ubda: couldn't mount because of unsupported optional features
(240).
EXT2-fs: ubda: couldn't mount because of unsupported optional features
(240).
List of all partitions:
6200    1048577 ubda driver: uml-blkdev
No filesystem could mount root, tried:  reiserfs ext3 ext2
Kernel panic - not syncing: VFS: Unable to mount root fs on
unknown-block(98,0)

This is a part of the entire log. Any help would be appreciated.

Regards,
Sarthak Dash
--
Research Assistant,
Insead Business School,
Fontainebleau,France-77300



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