I am using fedora 18 and kernel version 3.11.10. The system was working well without any problems and when booting the system it goes into emergency mode and gives these messages

EFI: Problem loading in-kernel X.509 certificate (-129)
modprobe: Error: could not insert 'sunrpc' : Required key not available
Warning: kernel module "sunrpc" not in the intramuscular, or support for filesystem "rpc_pipefs" missing!

I tried to reboot into the default mode but the same error. How can I solve this problem?

I am afraid of losting very important work files.

Fedora 18 is TWO (2) years past end-of-life. The problem it's having with EFI isn't surprising, since there WAS no such thing that long ago. Either disable it in your BIOS and set it to Legacy, or (better) load a CURRENT version of Fedora. The UEFI instructions are easily found on Fedora's site:
https://docs.fedoraproject.org/en-US...re_Boot_Guide/
Then why are you using such an ANCIENT system, without having good backups? Data can't be too important if you haven't backed it up, and haven't kept up to date...

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