Android Ladybug Empty Activity Example Stuck in "Launching App"

Question

Brand new to Android. Just installed Ladybug on a Linux machine and followed the "Create your first Android app" by creating an empty activity application. Gradle build successful. When I try to launch the app (emulator Medium Phone API 35), the IDE has "Launching App" forever and the "Running Devices" just has a Google logo, nothing else. What's going on? Shouldn't a built-in example actually work?

Finally, got the error message:

Error running 'app'

The application could not be installed. Installation failed due to: 'Error Code: 'UNKNOWN', message='Unknown failure: 'cmd: Can't find service: package"

List of apps:

\[0\] '\<path to studio and app\>/build/intermediates/apk/debug/app-debug.apk'

And the emulator shows:

System UI isn't responding

X Close app

\<clock\> Wait