Networking issues with Ubuntu 25.10 in a standalone qube using sys-whonix

User Support General
1

I have installed Ubuntu 25.10 in a standalone Qube and configured it to use sys-whonix for networking. However, I’m experiencing issues, as I am unable to access the web or install packages via the terminal.

The wired connection in Ubuntu is active, and I can confirm that it recognizes the MAC address when I execute the command ip link show. Additionally, I created another standalone Qube using a Debian template with sys-whonix for networking, and that works without any issues.

I am uncertain what might be wrong with the Ubuntu setup. Any guidance would be greatly appreciated.

Thank you very much.

2

How did you install Ubuntu in the SVM? Through the installation ISO? I think that in such a case you’ll need to manually set the IP address, gateway, DNS and netmask in your SVM’s network settings.

3

Yes.
But in case it matters, I didn’t select the file from another qube. I used the ‘From existing block device’ option and installed it from a bootable USB.

Thank you.

4

Standalone qube should run as HVM, not as PVM.

You can read more here:

5

It is running as HVM.

6

Quote:

Network configurations for post-installation will be similar to HVM - Networking.

Does that work?

7

Yes.

Thank you.

1 Like
8

Unfortunately, I’m experiencing the same issue, but the solution in here doesn’t work…

9

Okay, I checked it only works when it uses sys-firewall as its net-vm.
It doesn’t work if I set sys-whonix as its net-vm.

10

Hey!

If that Ubuntu 25.10 standalone came from the ISO, that’s the issue.

It won’t talk to sys-whonix right without the qubes core agents. The template already has them, so Debian works.also By default, Ubuntu 25.10 uses netplan and systemd-networkd, which breaks DHCP in Qubes.

Change netplan to NetworkManager and install qubes-core-agent-networking and qubes-core-agent-network-manager.You shouldn’t have to set up IP/DNS by hand with sys-whonix.

If you do, the agents/NM aren’t set up correctly.