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

[Colin Watson]

The GRUB maintainer scripts won't run update-grub unless
/boot/grub/grub.cfg already exists, so your installation script must run
it.  It shouldn't be particularly slow unless os-prober has to go out to
lots of slow disks.

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

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

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