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I have a ubuntu 9.04 server, I tried to install webmin on my server. Based on the webmin instructions and I did some apt-get update, however After I restart, the server can't boot and shows this:

     mount: mounting none on /dev failed: No such device
     W: devtmpfs not available, falling back to tmpfs for /dev
     Gave up waiting for root  device. Common problems:
     Boot args  (cat /proc/cmdline)
     Check rootdelay= (did the system wait long enough?)
     Check root= (did the system wait for the right device?)
     Missing modules (cat /proc/modules; ls /dev>
     ALERT! /dev/mapper/main-root does not exist. Dropping to a shell!


Now, its about 20 hours I'm searching every single topic on the internet. I don't know exactly which option is applicable for me, either to reinstall the kernel from live CD/USB, or reinstall the grub. Can anyone please advice and help me through this ???

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