[Bug 1310087] Re: update-grub run multiple times during distribution upgrade

[Peter Cordes]

This kind of thing happens because each package has scripts to make sure
needed stuff gets done, and there's no mechanism for telling it that
more things are going to change again later.

 do-release-upgrade doesn't know the details of what every package does
in its postinst.  Things don't happen in one giant set of installs and
removals; instead there are smaller batches of changes to minimize how
much stuff has to run while there are broken dependencies.

 Is there a way to flag launchpad bugs as wishlist?  Even if so, it's
hard to imagine any way to minimize repeated work without making it more
vulnerable to being left broken on errors / interruptions.

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https://bugs.launchpad.net/bugs/1310087

Title:
  update-grub run multiple times during distribution upgrade

Status in “ubuntu-release-upgrader” package in Ubuntu:
  New

Bug description:
  During a system distribution upgrade, the grub boot list is built and
  rebuilt multiple times. It seems it is built first after installing
  the newest linux kernel, and then after each removal of an older
  (obsolete) kernel.

  Description:	Ubuntu 14.04 LTS
  Release:	14.04

  update-manager:
    Installed: 1:0.196.11
    Candidate: 1:0.196.11
    Version table:
   *** 1:0.196.11 0
          500 http://ubuntu.mirror.frontiernet.net/ubuntu/ trusty/main amd64 Packages
          100 /var/lib/dpkg/status

  It is expected to have the grub boot list built only once.

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