Saved my sister's old #chromebook by installing #xubuntu - Followed an online guide to the letter with no probs.
She reminded me today of this message that pops up on boot for a brief while at the start.
'OS verification is off'
'Press Space Bar to Enable'
I told her to ignore it and in fact definitely *not* press the space bar.
She's fine with that and delighted with the rejuvenated machine.
But I am only guessing that's the correct advice tbh. Anyone know anything?