This is about GDM, which is the last thing that gets started. Hardware devices are initialized before init is started, so you should still be able to gather en

This is about GDM, which is the last thing that gets started. Hardware devices are initialized before init is started, so you should still be able to gather entropy from the various input devices. Lack of entropy can't cause the kernel to not boot; it's just userspace (typically services which require encryption) which can have a problem. It would be silly to start a webserver or sshd before the FS is remounted rw.