Homeassistant:8123 or http://X.X.X.X:8123 not reachable, on Ubuntu installation

[dcamp666 (Domenico Campagnolo)]

Hi,
I am at my very first installation of Home Assistant.
My setup is as following:

• Machine: Lenovo ThinkCentre M83
• OS: Ubuntu 25.10
• Hypervisor: Virtual Machine Manager 5.1.0

These are my installation’s steps:

1. Network Selection: Bridge device → nm-bridge

2. Firmware: UEFI x86_64: /usr/share/OVMF/OVMF_CODE_4M.fd

3. Add Hardware: Channel (qemu-ga):
   

   
   
   which looks like is not working as expected (State: disconnected)

4. and then I can see the UEFI Interactive Shell v2.2

   • Mapping Table
     • BLK0: Alias(s): PciRoot(0x0) / Pci (0x1F,0x2) / Sata (0x0, 0xFFFF, 0x0)
     • BLK1: Alias(s): PciRoot(0x0) / Pci (0x2,0x3) / Pci (0x0, 0x0)

Even if the Home Assistant VM is up and running, I cannot reach it from the host machine. It seem to be a networking issue.
Does anyone know how to fix it?

Thanks in advance for your assistance.

[dcamp666 (Domenico Campagnolo)]

on the host system, I can’t find any service at the port 8123

[jhol-byte]

did you check Linux - Home Assistant?

I used the KVM image and it works like in the description. To reach the VM from outside my host system it was necessary to bind the bridge interface to a LAN connection though (see How to Configure Network Bridge in Ubuntu)

In the VM you should see something like

[Batty]

Again, using an old Lenovo Thinkcentre. Have installed from an Ubuntu Flash drive and get to the command line interface as shown above and then the system won’t play nicely. I enter the http://homeassistant.local:8123 which returns an error message unknown command http://homeassistant.local:8123 for ha.
I have also tried to enter the IPv4 address but same outcome.

Help please

[Impact]

Please share a picture of that unknown command output.

[armin-gh (ArminH)]

You can’t open a browser with that URL on your Thinkcentre, HAOS ( assuming that is the installation method you used) does not have a graphical UI. That what you did, right? At the “ha” prompt you entered this command?

You have use the URL in the Browser of your choice on a separate device ( Windows, Linux, Mac, Mobile, … ) in the same network to finish the installation

[dcamp666 (Domenico Campagnolo)]

Shame on me!
I used the compressed image as iso!
Thanks everyone for the assistance

… all good now