I installed Ubuntu 11.10 with the alternate CD and encrypted the whole system (except boot) with the encrypted LVM. Everything works great as before, but I would like to change the password of the encrypted LVM. I tried to follow the Tips and Tricks of this article, but it does not work. After typing:
sudo cryptsetup luksDump /dev/sda5
It says: "Device /dev/sd5 doesn't exist or access denied." I thought the encrypted partition is /dev/sda5. Any help how to change the password?