1 Desktop

Go to System > Administration > Software Sources:

Type in your password:

In the Software Sources window, go to the Updates tab and select Normal releases in the Show new distribution releases drop-down menu; then close the Software Sources window:

Now start the Update Manager (System > Administration > Update Manager):

The Update Manager should show that a new distribution release (8.10) is available. Click on the Upgrade button to start the distribution upgrade:

A window with the release notes for 8.10 comes up. Click on Upgrade again:

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The upgrade is being prepared:

Click on Start Upgrade to finally begin with the upgrade process:

Replace /etc/update-manager/release-upgrades:

At the end of the upgrade process, you should remove obsolete packages:

The system needs to be rebooted to complete the upgrade, therefore click on Restart Now:

After the reboot, you can use your new Ubuntu 8.10 desktop:

2 Server

First become root:

sudo su

Then run

apt-get update

and install the package update-manager-core:

apt-get install update-manager-core

Open the file /etc/update-manager/release-upgrades...

vi /etc/update-manager/release-upgrades

... and change Prompt=lts to Prompt=normal:

[...]
Prompt=normal

Then run

do-release-upgrade

to start the distribution upgrade.

Confirm that you want to do the upgrade:

Do you want to start the upgrade?


2 packages are going to be removed. 48 new packages are going to be
installed. 376 packages are going to be upgraded.

You have to download a total of 242M. This download will take about 6
minutes with your connection.

Fetching and installing the upgrade can take several hours. Once the
download has finished, the process cannot be cancelled.

 Continue [yN]  Details [d] <-- y

At the end of the upgrade process, you should remove obsolete packages:

Remove obsolete packages?


21 packages are going to be removed.

 Continue [yN]  Details [d] <-- y

The server needs to be rebooted to complete the upgrade:

System upgrade is complete.

Restart required

To finish the upgrade, a restart is required.
If you select 'y' the system will be restarted.

Continue [yN] <-- y

After the reboot, your server is running Ubuntu 8.10.

Error occurred on below ...

W: GPG error: http://dl.google.com testing Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY XXXXXXXXXX

Resolve on below ...

gpg --keyserver keyserver.ubuntu.com --recv XXXXXXXXX

gpg --export --armor XXXXXXXXX | sudo apt-key add -

sudo apt-get update

DONE