Mr. Meissner -
Thank you for your email on the upgrade.
When I upgraded in place (not a fresh install) to openSuSE 15.1 as the native OS (from 15.0), I ran into problems with a virtualbox installation, ultimately losing the entire system and doing a complete reinstall. Upgrades in place on two other machines without virtualbox went smoothly - no issues.
The problem may have been due to the presence of virtualbox or my use of the btrfs file system, but perhaps some other cause - an error on my part.
Based on a post on the virtualbox forum, I learned that one fellow successfully performed the upgrade and I've inquired about the details. I did not find anything else relevant on either the openSuSE forums or after a search of the web.
Are you aware of any issues I should consider? Any advice you might have would be greatly appreciated.