Ubuntu used a patch for this, but it's just a work-around for now and multiple upstream's developers told me that is not the right approach to use. -- debbug#555134 ...
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ID Status▼ Resolution Sev Product▲ Comp Assignee▲ Reporter Summary
37661 CLOS DUPL cri Sisyphus alterato ekorneechev ldv fails to install into /boot/efi/ when /boot is on a LUKS partition

File a new bug in the "alterator-grub" component of the "Sisyphus" product