[Bug 1373137] [NEW] need to run update-grub when grub-install

[Scott Moser]

Public bug reported:

I noticed this when installing ppc64el, as boot would fail.   It would fail because no /boot/grub/grub.cfg existed.
I'm not entirely sure when we need to run update-grub.

I know that the 'install_grub' was choosing to *not* run update-grub
because sometimes dpkg-reconfigure would do the same thing, and that was
a slow operation.

Its possible there are more complex symantics involved than I
understood.  But we were not running 'update-grub' in order to save some
time.

Basically, as input to 'install_grub', we have:
  * the target to install to (/dev/sda1 or /dev/sda)
  * the dpkg arch
  * the name of the package to 'dpkg-reconfigure' (derived from the dpkg arch and whether or not to use uefi).
    we dpkg-reconfigure because we may change the GRUB_CMDLINE_LINUX_DEFAULT to include additional options such as console=

>From my memory, it seemed like on amd64 and i386, running 'dpkg-
reconfigure grub-pc' would end up running update-grub.  I then chose not
to run update-grub because it was slow.

Colin,  Is there some simple logic that I can use to determine when
running update-grub is needed?

** Affects: curtin
     Importance: High
         Status: Triaged

** Affects: curtin (Ubuntu)
     Importance: High
         Status: Triaged

** Also affects: curtin
   Importance: Undecided
       Status: New

** Changed in: curtin (Ubuntu)
       Status: New => Triaged

** Changed in: curtin
       Status: New => Triaged

** Changed in: curtin
   Importance: Undecided => Medium

** Changed in: curtin
   Importance: Medium => High

** Changed in: curtin (Ubuntu)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1373137

Title:
  need to run update-grub when grub-install

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