Public bug reported:

grub-legacy-ec2 is a binary package provided by Ubuntu cloud-init
source package.  I'm hoping that we can finally sunset this thing in
bionic.

Canonical no longer publishes PV images on EC2, so there is no need
for this package in EC2 images speficially.
  (http://paste.ubuntu.com/p/W5H33Mb7Pz/)

I'd like to drop this from cloud-init and suggest pv-grub-menu to
anyone looking for equivalent function.

It seems like we would likely want to include pv-grub-menu in the images.
That would be useful to non-aws users of xen (IBM/Softlayer) or users
publishing their own images to amazon.
 
Some background info:
 * grub-legacy-ec2 has really no relevancy to cloud-init.  It just got
   stuck there within the first year I worked for Canonical because I
   didn't really know any better.  It would have been better if it was a
   separate package from the start.  Force of friction  left it where it
   was.
 * grub-legacy-ec2 builds a /boot/grub/menu.lst file for installed kernels
   the same way 'update-grub' builds /boot/grub/grub.cfg but does so
   without conflicting with grub2 or attempting to install a bootloader.
   That boot/grub/menu.lst file is then read (most commonly) by a program
   named 'pv-grub'.
 * 'pv-grub-menu' that does roughly the
   equivalent, but possibly does not have some of the changes that we've
   made to grub-legacy-ec2 to properly identify xen kernels.  It even
   'Provides' grub-legacy-ec2.
 * currently ubuntu-server/server seed explicitly includes grub-legacy-ec2
   that is the only reverse-depends.

** Affects: cloud-images
     Importance: Undecided
         Status: New

** Affects: cloud-init (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: pv-grub-menu (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: cloud-init (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: pv-grub-menu (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: cloud-init (Ubuntu)
    Milestone: None => ubuntu-18.04

** Changed in: pv-grub-menu (Ubuntu)
    Milestone: None => ubuntu-18.04

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https://bugs.launchpad.net/bugs/1756420

Title:
  replace grub-legacy-ec2 with pv-grub-menu

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