No boot menu after installing Ubuntu 11.10 on a Dell Windows Vista Home laptop computer?

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http://askubuntu.com – I just installed Ubuntu 11.10 on a friends Dell Inspiron laptop. I normally boots up to Windows Vista Home Edition. As part of the install procedure I reduced the size of the largest ntfs partition to allow space for an ext4 root partition and a small swap partition. After the install completed it prompted to restart and what followed was a reboot with Windows coming back up without any multiboot menu screen. Where is the grub boot menu? (HowTos)