TechRepublic shows you how to upgrade Ubuntu 18.04 to 19.10 from the command line
How to upgrade Ubuntu 18.04 to 19.10 from the command line
If you have a reason for upgrading from Ubuntu 18.04 to the non-LTS 19.10, you're not out of luck. Learn how this is done from the command line.
How to upgrade Ubuntu 18.04 to 19.10 from the command line