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.

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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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