id summary reporter owner description type status component version resolution keywords cc guest host 17473 GRUB countdown problem vbgaofei "The file /etc/default/grub contains GRUB_TIMEOUT=5 by default . After starting my Guest OS , it will show a sentence ""The highlighted entry will be executed automatically in 5s"" . VirtualBox has such a problem that makes GRUB (That's Guest OS ,but not host OS) unable to show this sentence when it's countdowning at 5s . After countdowning at 5s , GRUB shows 4s 3s 2s and 1s very normally . This problem doesn't always appear ,but only sometimes appears " defect new other VirtualBox 5.1.26 Linux Linux