If you have wanted to encrypt your Ubuntu installation on your hard drive quickly and easily, with Ubuntu 7.10 "Gutsy Gibbon" it's become even easier now that the alternate installer supports encrypting partitions. However, the Ubuntu 7.10 "Gutsy Gibbon" Ubiquity installer currently lacks LVM and dm-crypt support.
The Ubuntu Wiki states: "Both the graphical and the alternate installer now support encrypting the hard disk." However, using yesterday's LiveCD with Ubiquity (v1.6.5) still hadn't contained the encryption functionality when doing a manual partition. If the Ubiquity installer doesn't support encrypting the hard drive in time for the Gutsy Gibbon release, we imagine it should ready in time for Ubuntu 8.04 Hardy Heron, which happens to be an LTS (Long Term Support) release.
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