Ctrl L stopped working – Dual Boot Linux Chromebook CB3-431

Problem

After using my Dualboot Acer Chromebook CB3-431 in ChromeOS, the ability to boot into Linux (GalliumOS) via the usual Ctrl-L command stopped functioning. Instead Ctrl-L resulted in beeps and I was effectively forced to re-enter ChromeOS.

Solution

The following fixed the problem for me and re-enabled my Chromebook to load Linux using Ctrl-L at start up.

1. Boot into ChromeOS using Ctrl-D and login

2. Open a terminal (Ctrl-alt-T) and re-enable boot from legacy and boot from USB
sudo crossystem dev_boot_usb=1 dev_boot_legacy=1

3. Reflash the firmware using MrChromeBox Utility Script (More Info)
cd; curl -LO https://mrchromebox.tech/firmware-util.sh && sudo bash firmware-util.sh

Now all is back to normal.

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