Hi

On Wed, Nov 4, 2015 at 6:43 PM, Joe Zeff  wrote:
 At no time during the upgrade from 19 to 20 was the computer otherwise unusable, and there was only one reboot needed, when the process was complete.  It took several tries because of glitches, such as needing to clear enough space for it to work, but each time that happened, the cause of the issue was clear because you could read the error message in the terminal.  Frankly, this unofficial method looks better to me than the official one, but YMMV.

The advantage of the current dnf upgrade method is that the upgrade happens in a special mode with only the minimal necessary to run the upgrade process and this minimized the conflict with running services and libraries in memory on the unofficial process.  The upgrade tool ideally should warn you about disk space issues and other conflicts *before* it does anything.  use --best to find that out and --allowerasing to remove packages as needed. 

Rahul