[kubuntu] LUKS, Grub, and startup boot choices

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http://ubuntuforums.org – I am running Kubuntu 12.10 on a LUKS-encrypted disk. The whole thing is working fine(*), but... on my previous PC, where I had a an unencrypted 10.04, I would get the Grub menu on startup, allowing me to choose a boot image or to run memtest. But I don't get this menu when I boot 12.10, it goes direcrtly to the LUKS passphrase. I did have a glimpse of the menu a couple of times... without knowing what made it show up (and didn't have the time to make a choice). The grub.cfg is indeed listing 3 images and memtest86. Is there something special to do to activate the menu? Or some key combo to (Hardware)