No User Interfaces on Landing Page in OH2

I have tried to upgrade to build 618.
For some reason OH2 deinstalled all UIs, therefore my landing paper is showing no UI anymore.

I have no idea why this is happening.
Please give me a hint.

Can I somehow manually install UI on the Karaf console?

I found the bug.
The newer version of OH2 seems to parse the addon.cfg better.
And if not ui specified here, then it is deinstalling the default UIs.

After adding

# A comma-separated list of UIs to install (e.g. "basic,paper")
ui = basic,paper,habpanel

the UI appeared again.

More info about that can be found here: