Update and upgrade your apt-get modules:

$$ sudo apt-get update
$$ sudo apt-get upgrade
$$ sudo apt-get dist-upgrade

To upgrade from Ubuntu 13.04 server to Ubuntu 13.10 server, do the following steps.
Install the update-manager-core package if it is not already installed:
sudo apt-get install update-manager-core
Edit the file /etc/update-manager/release-upgrades,

$$ sudo nano /etc/update-manager/release-upgrades
and set “Prompt=normal” as shown below.
# Default behavior for the release upgrader.

[DEFAULT]
# Default prompting behavior, valid options:
#
# never – Never check for a new release.
# normal – Check to see if a new release is available. If more than one new
# release is found, the release upgrader will attempt to upgrade to
# the release that immediately succeeds the currently-running
# release.
# lts – Check to see if a new LTS release is available. The upgrader
# will attempt to upgrade to the first LTS release available after
# the currently-running one. Note that this option should not be
# used if the currently-running release is not itself an LTS
# release, since in that case the upgrader won’t be able to
# determine if a newer release is available.
Prompt=normal
Now it is time to upgrade your server system to latest version using the following command:

sudo do-release-upgrade -d
Follow the on-screen instructions. You’re done!!.

from :

http://lawrit.lawr.ucdavis.edu/it-help-center/how-to/upgrading-ubuntu-via-command-line

http://www.unixmen.com/upgrade-ubuntu-13-04-raring-ubuntu-13-10-saucy-salamander/

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