Update manger do not provide option to upgrade. It displays "Your system is up-to-date" instead. I tried Check button many times but received same message. Please help.
NOTE: Specific to upgrade of 11.10 to 12.04 (and not from 10.04 LTS)
From: ubuntu.com - UbuntuDesktop - Upgrading - GUI method
Upgrading from Ubuntu 11.10
To upgrade from Ubuntu 11.10 on a desktop system, start "Update Manager". It should display the following message: "New distribution release '12.04' is available. Click Upgrade and follow the on-screen instructions".
I can confirm this works on my Ubuntu 11.10 desktop.
From: ubuntu.com - UbuntuServer - Upgrading - command-line method
From 11.10 to 12.04
To upgrade from Ubuntu 11.10 on a server system, follow the steps listed below:
Install the update-manager-core package (if it is not already installed).
Run sudo do-release-upgrade to launch the upgrade tool. Follow the on-screen instructions. Note that the server upgrade is now more robust and will utilize GNU screen and automatically re-attach in case of dropped connection problems, for example.
So, type the following commands:
Addition: October 24, 2012 @ 4:31:50 EST
Poke into your System Settings, and look for 'Software Sources'. In this window, look to the option that the black cursor is pointing to, and change it to what's shown:
I had to do an apt-get purge update-manager-core and the install update-manager-core before do-release-upgrade would recognize any new releases for 11.10.
protected by Community♦ Aug 17 '12 at 11:28
Thank you for your interest in this question.
Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).
Would you like to answer one of these unanswered questions instead?