Can not upgrade Server Edition

Can someone tell me how can I upgrade my ubuntu server 10.04 to ubuntu server 10.10?

I try:

sudo apt-get install update-manager-core
sudo do-release-upgrade

Output:

Checking for a new ubuntu release
No new release found


sudo apt-get dist-upgrade

Output:

Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

The problem is you are in a LTS version and 10.10 is a normal version.

Here are the steps:

Be sure that you apply all updates to your current version of Ubuntu before you upgrade:

sudo apt-get dist-upgrade

Now perform this procedure:

Network upgrade for Ubuntu servers (Recommended)

1. Install update-manager-core if it is not already installed:

   sudo apt-get install update-manager-core

2. Edit /etc/update-manager/release-upgrades and set Prompt=normal.

3. Launch the upgrade tool:

   sudo do-release-upgrade

4. Follow the on-screen instructions.