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?

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    Press the [Shift] at initial boot should bring up the grub menu. If that fails, then boot your VM with the installation ISO image or any recovery CD image. Mount you root partition and fix /tmp. – garethTheRed Aug 7 '14 at 8:28
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    If you can't get a grub screen the problem has nothing to do with the permissions on /tmp. – goldilocks Aug 7 '14 at 9:25
  • @kolar If you are able to boot, you should check the timeouts in /etc/default/grub – beginer Aug 7 '14 at 9:36
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    Just boot into the live session in the same way as when you installed, mount the Ubuntu drives and fix them. – terdon Aug 7 '14 at 11:12
  • My installation disk was Ubuntu 10, but I upgraded that thus it's Ubuntu 12.04. Booting VM with installation ISO image (Ubuntu 10) does not show my Ubuntu 12.04. It just try to install Ubuntu 10. – kolar Aug 8 '14 at 1:20

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