connect 2 sessions on your Linode
On the second, run this:
dd if=/dev/urandom of=/dev/null
on the first one, do the following:
pacman-key --init
You can stop the dd process on the second connnection
pacman-key --populate archlinux pacman-key --refresh-keys
Update pacman
pacman -Sy pacman
Update your installation
pacman -Syu
Enjoy a quick cofee
That should do it