- FLAVOR: Ubuntu Desktop (or any)

- HEADLINE: Installer should allow dual boot with encrypted disk

- DESCRIPTION: Currently it is impossible to use the Ubuntu installer to install Ubuntu on only part of a disk if you want the Ubuntu partitions to be encrypted. (If it's not impossible, it's hard enough to figure out that this advanced user couldn't, so it might as well be impossible for new users.)

Disk encryption is a requirement nowadays, and many users want to dual boot when they first install Ubuntu. So this prevents users from even trying Ubuntu.