[ubuntu] Can't mount other partiotions

view story

http://ubuntuforums.org – Hi, I've got a problem I hope you can help me to solve. I 've got a laptop with three OS; Ubuntu 12.04 (with a parition for /, and another for /home) Windows 7 Debian Testing (I have installed it in a LVM, with 4 partitions /boot (non encrypted), and swap, /home and / (all of them encrypted). The problem, is that I can not mount/see/find my Debian partition when I am using Ubuntu (I type the right passphrase but the volume where Debian is located is not mounted). The consequence of all this is that if I start my laptop using the "ubuntu grub" I can't see my Debian partition in t (Hardware)