Daily Archives: 1 February 2018


Qubes-OS 3.2: USB printer (and other devices)

Below you will find the commands we used to enable the sys-usb VM (on an installation of Qubes 3.2 where it was not enabled by default nor was the task of handling USB devices assigned to sys-net).

On dom0 terminal emulator, we executed the following first to enable sys-usb.

sudo qubesctl top.enable qvm.sys-usb;
sudo qubesctl state.highstate;

Then we modified the configuration files for the mouse (/etc/qubes-rpc/policy/qubes.InputMouse) and keyboard (/etc/qubes-rpc/policy/qubes.InputKeyboard) so that they will automatically be granted to dom0 without prompting the used each time.

We modified the content /etc/qubes-rpc/policy/qubes.InputMouse and /etc/qubes-rpc/policy/qubes.InputKeyboard to be as below:

sys-usb dom0 allow,user=root
$anyvm $anyvm deny

Qubes-OS 3.2 GNU/ Linux: Temporarily enable second language for keyboard

Recently we started using Qubes OS 3.2, at some point we needed to enable the Greek language keyboard for a Fedora 23 based VM.

To avoid making permanent change to the VM we used the following command that enables the US and GR keyboard layouts while switching is made available by pressing the two shift buttons at the same time.

setxkbmap -layout "us,gr" -option "grp:shifts_toggle";