If you are like a lot of users who were “early adopters” of Linux disk encryption, you probably installed with the aes-cbc-essiv encryption scheme, which is decent, but not as secure as the new aes-xts-plain encryption method.
There is a helpful post on the Ubuntu bugtracker explaining how to install Ubuntu with i.e. XTS support. Unfortunately, this does not help a user who wishes i.e. to change encryption methods while upgrading his hard disk.
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