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I have some business to downgrade the kernel in Ubuntu 9.10.

I downgraded from kernel 2.6.31-14 to 2.6.26.8. Then I got the following error in my boot process :

warning: unable to find a suitable fs in /proc/mounts, is it mounted?
use --subdomainfs to override

What does that mean anyway?

Thanks.

share|improve this question
    
My gut says that Ubuntu doesn't support kernel versions lower than what the distribution was designed for (it probably applies to other distros as well). Some program wants to use a kernel feature that is only in 2.6.31 (or anything higher than 2.6.26), so it will not work. – petersohn Apr 30 '10 at 9:46
    
Do you have any ext4 formatted partitions? – Josh Apr 30 '10 at 22:05

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