The default installation of Clear Linux OS does not set a timeout value for the systemd-boot bootloader. At boot time, you will not be presented with the systemd-boot menu. Without a menu, you cannot interact with systemd-boot such as selecting a different kernel, editing kernel command line parameters, etc.

To set a timeout value for the systemd-boot menu, follow these steps:

1. Boot up Clear Linux OS.

sudo clr-boot-manager set-timeout 20