I cannot login my Ubuntu12.04 (which is VM running on OSX using VMWARE FUSION 6) because I have changed permission of
/tmp for some purpose before rebooting the machine.
Thus I tried to boot Ubuntu in recovery mode by pressing
shift key while booting the machine (in order to change the permission of
/tmp), but it was not possible because no grub screen appears while booting.
How can I get into recovery mode if grub does not appear?