I wanted to upgrade my work machine to Intrepid Ibex (Ubuntu 8.10) from Hardy Heron (Ubuntu 8.04), but the update manager was not showing the distribution/release upgrade button. This is due to 8.04/Hardy being an Long Term Support (LTS) release, and 8.10 (Intrepid Ibex) not. Therefore, you’ll first need to enable distribution upgrades in the ‘Software Sources’ settings applet. I followed the instructions here, but the basic idea is thus:
- Open ‘Software Sources’ by following these menu choices: System -> Administration -> Software Sources
- In the Software Sources applet, select the ‘Updates’ tab
- In the section at the bottom entitled ‘Release Upgrade’, select ‘Normal’ from the dropdown menu.
- Click the Close button, and let it update your apt package lists
After following these instructions and opening Update Manager, I was still not seeing the release upgrade button. I ensured that my packages were up-to-date, and upgraded anything that needed it, restarted several times, but still no release upgrade button! Ahhh!
Thankfully the solution is simple, you just need to start update-manager with the -d flag in a shell:
user@box$ update-manager -d
This will open up the manager and after a clicking the ‘Check’ button (to update the package list), the upgrade button was showing. Hooray!