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I have seen the answers to the general question regarding resizing the boot partition. In my case, I have installed Ubuntu 12.04 Alternate with full disk encryption. Since the drive can not be mounted during the resize operation, won't this corrupt the main partition?

I have everything backed up so I could potentially do a re-install, but I do not know how to specify the boot partition size prior to encryption.

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I assume by full disk encryption, you mean having a small unencrypted boot partition and another partition which is a physical volume for encryption (dm-crypt). If there isn't any space in between them, you won't be able to non-destructively resize the encrypted partition to create more space for /boot.

Take a look at my answer here - this might help.

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