Comment 27 for bug 360378

I had the same problem on my wife's Netbook (Toshiba NB200) after upgrading from Ubuntu Netbook Remix 9.10 to Lucid using the standard upgrade procedure.

I tried the extending the "rootdelay" altering the Grub instructions to look for /dev/sdax instead of the UUID but neither worked.

However after downloading a Lucid Ubuntu Netbook Edition .iso image and booting from a USB drive Rick Silva's suggestion at comment #26 above worked. I copied initrd.img-2.6.32-21-generic from the RAM disk once I'd booted off the USB drive.

I can now boot from 2.6.32.21 on my hard drive. HOWEVER I cannot boot from 2.6.32.22-generic which was installed a few days ago by the Update Manager. Using synaptic to remove 2.6.32.22-generic and re-install it does not solve the problem.

The initrd.img I copied from the USB boot is about 12.9 Mb but the initrd.img files on my hard disk are about 7.6 Mb.

What is the underlying problem here? Is there something else about my upgrade to Lucid which is resulting in initrd.img files being damaged, or incorrectly constructed? How might I diagnose what is going on?

I'm not expert in Linux boot time processes, but I'm happy to do my bit to diagnose the underlying issue. I'd like to see this fixed properly so Ubuntu genuinely can be used by ordinary humans, like my wife, not just people who roam technical websites.