Error in my Ubuntu security update.

Hello Experts,
I got the error message when try to have an Ubuntu security update.
It’s seemed there’s no problem with other application that I download like Wine and Virtual box.
I Have checked my internet connection and have it test speed, no problem.
Has anyone experience this error that I’m facing please give any inputs.

Error :
An error occurred
The following details are provided:
W: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/x/xorg-server/xserver-xorg-core_1.3.0.0.dfsg-12ubuntu8.1_i386.deb
403 Forbidden
Thanks!
