How to fix outdated and unsupported Ubuntu versions

rooty@FOGSERVER01$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 13.10
Release: 13.10
Codename: saucy

Ubuntu 13.10 (Saucy Salamander) was released on 17 October 2013 and its support will end in July 2014. However, some third-party drivers already installed on the system may not function if we upgrade this release to version 14.1 LTS.

:wq

sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup
vim /etc/apt/sources.list
%s/us.archive.ubuntu.com/old-releases.ubuntu.com/gc
%s/security.ubuntu.com/old-releases.ubuntu.com/gc
:wq

sudo apt-get update --fix-missing
sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup1
sudo cp /etc/apt/sources.list.backup /etc/apt/sources.list or sudo vim /etc/update-manager/release-upgrades
%s/old-releases.ubuntu.com/us.archive.ubuntu.com/gc
%s/old-releases.ubuntu.com/security.ubuntu.com/gc
If running into error with "E212: Can't open file for writing"
:w !sudo tee % > /dev/null

sudo apt-get update && sudo apt-get dist-upgrade
reboot

# Check version after reboot
cat /etc/lsb-release

# Install VNC
sudo iptables -A INPUT -p tcp --dport 5900 -j ACCEPT
sudo iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT