When Ubuntu fails to boot, it will enter the recovery mode in GRUB2 which will disable the timeout, so it will stay on the GRUB menu and will not proceed to boot the OS as the timeout is disactivated.
One workaround is to disable it so that the timeout doesn't get disactivated. https://help.ubuntu.com/community/Grub2 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1414396 Title: ubuntu dropped to initramfs shell after reboot several hours To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/1414396/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs