The following instructions are valid for Qubes OS R4.0 legacy mode and Qubes OS R4.1 legacy and UEFI modes. For Qubes OS R4.0 in UEFI mode, there is no GRUB, so manual boot from another operating system is needed.
In several cases, there is a need to prevent
autostart=True for qubes on
boot. For example:
sys-usbwas enabled, but the only keyboard is attached via USB, and the
qubes.InputKeyboardservice is disabled.
- A PCI device assigned to an autostarting qube crashes the system (e.g., a GPU or RAID controller card).
To address this, there is a
qubes.skip_autostart option for the kernel
command line. You can use it at the grub boot menu.
E key on the first prompt (or your custom prompt). Then, press the
down arrow key multiple times to reach the line starting with
qubes.skip_autostart to the end of this line (generally after the
rhgb quiet options).
Ctrl+X to boot with the edited GRUB entry. The boot will proceed as
usual from here, except that no qube will be autostarted.