Just installed GalliumOS through chrx, and ctrl+L is not working.

So, I followed the chrx installation instructions on https://wiki.galliumos.org/Installing, got through all the steps (it even said chrx installation succeeded, and told me that I could boot through ctrl+D and ctrl+L), and rebooted.

However, whenever I press ctrl+L on the weird developer start up screen, it makes two loud beeps then doesn't do anything. ctrl+D works perfectly fine though and I can use ChromeOS normally.

Please help me! I'm very new to all this Linux stuff and I have no idea what's going on here. Thank you.