Welcome to Android Central! On the official site, it says for the Toshiba Chromebook 2 on Beta, "*NOTE: Devices with a (*) next to them require that user profiles perform a one-time file-system migration in order to support Android on these older devices. For Education and Enterprise customers they can manage this file-system migration remotely in the Admin console by utilizing a new migration setting." Then they link to this support article: https://support.google.com/chrome/a/answer/7476274. See if that helps.