Somehow, a major bug has gone through three experimental channels and gotten into a Chrome OS stable channel – the AKA channel that the vast majority of Chromebook owners use. This bug is in Chrome OS 91.0.4472.165 and does not allow users to sign in to their Chromebooks again after the update, and in some cases the laptop starts up so that they do not have access to the lock screen. In these cases, you will need to create a Chromebook Recovery USB stick using the Chromebook Recovery Utility and use it to re-image your Chromebook.
If the update is downloaded but the installation is not complete, do not turn off your Chromebook. The update will be installed at the next reboot or system shutdown.
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Google seems to be aware of the situation and should work on a solution soon, but the update has not been pulled yet, it seems, so do not go to About Chrome OS screen, do not check for updates, and do not turn off Your Chromebook if you can help.
Users who unfortunately received the update first are currently locked out of their machines, at least until they wash them. Once users have affected the Chromebook to factory settings, they can reset it and come back in, but keep in mind that this is a factory reset and will delete all local data and Linux application data. If you can wait for a solution, you may be able to wait and then update your Chromebook from Guest Mode, but we do not have a schedule for an update.
We reach out to Google to ask when they can have a timeline for the solution and how this has happened twice in such a short time. We update this story as things progress.