Boot-Repair's advanced mode has the reinstall of grub and a checkbox for including newest kernel.
But Boot-Repair has issues with LVM with encryption. Just make sure you have mounted the LVM and given password to unencrypt your system.
Both RAID & LVM use /mapper, so Boot-Repair tries to figure out which you have but does not always work & then encryption prevents it from seeing / (root).
See the first steps to mount your encrypted LVM up to the part where it says you can now do other repairs or maintenance.
How to: Mount & Resize an Encrypted Partition (LUKS) also mount for repairs
http://ubuntuforums.org/showthread.php?p=4530641
The old instructions also were before UEFI. So you also have to mount your ESP - efi system partition.
I do not know LVM, if someone does that would be better to help this user.
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