Those of you that already updated to 2021.01 maybe already noticed that the WebUI incorrectly says "2021.02", and the same information is present at /etc/uyuni-release 
We added an update to the Patches repository  that can be installed on top of 2021.01 to fix this issue. The patches repository also contains updated release notes with the information about the WebUI not starting because of a vendor change for some Java dependencies 
To get the fixes installed, follow the next steps (as root) at the Uyuni Server:
1. Install the patches repository (if it's already present, zypper will exit with an error that you can just ignore)
2. Refresh the repositories:
3. Stop the services:
4. Run the update (this will get you updates for at least release-notes-uyuni, spacewalk-base, spacewalk-base-minimal, spacewalk-base-minimal-config, spacewalk-common, spacewalk-html, spacewalk-postgresql, susemanager-web-libs and any other pending updates from Leap):
5. After the update is complete, start the services:
You will see the correct version 2021.01 at the WebUI, /etc/uyuni-release as well as the updated release notes.
NOTE: Starting the services will tell you about a schema upgrade. Do not worry. That is perfectly normal and you will see that message each time you start the services. An upgrade is always attempted, in case there is something pending.