How to upgrade ubuntu 18.04 to 18.10?

Question

set Prompt=normal in /etc/update-manager/release-upgrades.

Answer 1

1. Open the Software & Updates app
2. Tap the Updates tab
3. Find the section titled Notify me of a new Ubuntu version
4. Set For long-term support versions to For any new version
5. Click Close

Then try update Ubuntu again.