Ubuntu 14.04 server - reboot (grub) hangs

etc-default-grub

problem: your server hangs on reboot

symptom: grub shows menu and waits for an input

> /etc/default/grub

contains the lines

    GRUB_HIDDEN_TIMEOUT=0
    GRUB_HIDDEN_TIMEOUT_QUIET=true

Well, these options are deprecated!

Try this

> vi /etc/default/grub

    #GRUB_HIDDEN_TIMEOUT=0
    #GRUB_HIDDEN_TIMEOUT_QUIET=true
    GRUB_TIMEOUT=2

and then

> update-grub

After next reboot your Ubuntu server should return to live automatically. ;-)