Basic UI not loading after fresh install

Setup, Configuration and Use Beginners
1

Platform information:
Hardware: Raspberry Pi 4 / 4GB RAM / 32GB microSD
OS: Raspberry Pi OS Lite (Debian 11)
Java Runtime Environment: OpenJDK 17
openHAB version: 4.1.2

Issue of the topic:
Basic UI not loading after fresh install. I can access the openHAB dashboard at :8080, but when I click on “Basic UI” it just shows a blank screen. Not sure if I missed a step during setup.

Please post configurations (if applicable):

Items configuration related to the issue
None yet – just starting out.

Sitemap configuration related to the issue

sitemap demo label="Main Menu"  
{  
    Switch item=Light1  
}

Rules code related to the issue
N/A

Services configuration related to the issue
Default settings

If logs were generated please post these here using code fences:

[WARN ] [.core.io.rest.internal.RESTActivator] - REST service has been restarted.
[INFO ] [io.openhab.core.model.script.rules] - Loaded demo.s
2

Is the basic UI add-on installed?

3

That blank dashboard symptom can show up if you have UI bundle missing or installed but it fails to startup into “Active” state, check with openhab-cli console and bundle:list.

A fresh install with 4.1.2?