Localhost:8080 is not reachable

http://localhost:8080 not working on broswers. unable to reach.
but my jenkins.service is active running on my virtualbox VM. Any idea how do we fix this ?

How are you running your virtual system? If jenkins is running on your virtual system at port 8080, there’s no reason it should be accessible on your laptop/computer at all on any port unless you do a port forward to the laptop.

How are you running your virutualbox virtual? Are you using vagrant, or virtualbox directly without vagrant? In either case you need to somehow do a port forward.