Fail to boot & read-only file system after upgrading from Ubuntu 10.04 to 12.04

Hello,

After upgrading from Ubuntu-10.04 to 12.04 lionde fails to reboot. Instead i got a long list of errors. Although the porcess succeeded for another linode.

Note: I followed the document "How to Upgrade to Ubuntu 12.04 (Precise)" (https://www.linode.com/docs/security/up … 04-precise">https://www.linode.com/docs/security/upgrading/how-to-upgrade-to-ubuntu-12-04-precise).

======================================= Some of errors ================

udevd[1035]: mknod '/dev/tty60' 4:60 020620' failed: Read-only file system

udevd[1035]: mknod '/dev/tty62' 4:62 020620' failed: Read-only file system

udevd[1017]: mknod '/dev/tty61' 4:61 020620' failed: Read-only file system

udevd[1017]: mknod '/dev/tty63' 4:63 020620' failed: Read-only file system

udevd[1035]: symlink '../tty7' '/dev/char/4:7.udev-tmp' failed: Read-only file system

udevd[1017]: symlink '../tty8' '/dev/char/4:8.udev-tmp' failed: Read-only file system

udevd[1035]: symlink '../tty9' '/dev/char/4:9.udev-tmp' failed: Read-only file system

udevd[1056]: mknod '/dev/vcsa3' 7:131 020660' failed: Read-only file system

udevd[1037]: mknod '/dev/vcs' 7:0 020660' failed: Read-only file system

udevd[1039]: mknod '/dev/vcs1' 7:1 020660' failed: Read-only file system

udevd[1042]: mknod '/dev/vcsa' 7:128 020660' failed: Read-only file system

udevd[1045]: mknod '/dev/vcsa1' 7:129 020660' failed: Read-only file system

udevd[1054]: mknod '/dev/md0' 9:0 060660' failed: Read-only file system

udevd[1019]: symlink '../xvdb' '/dev/block/202:16.udev-tmp' failed: Read-only file system

udevd[1019]: symlink '../../xvdb' '/dev/disk/by-path/xen-vbd-51728.udev-tmp' failed: Read-only file system

======================================= Errors end =======================

I have tried "fsck" many times but nothing changed. Even i tried to remove the option "errors=remount-ro" from fstab but nothing changed.

Now i can not boot, PLEASE HELP.

Thanks in advance,