Here are some quick and simple steps to upgrade your OpenMediaVault (OMV) to the latest version; OMV 1.0  (Kralizec).

SSH into your OpenMediaVault server; in my case I am running OMV 0.5 and run the following command:

apt-get update && apt-get dist-upgrade && omv-update

Then type the following command:

omv-release-upgrade

Once completed you can either restart the web services or reboot the system and your all set.