[Bug 1248320] [NEW] selecting "show differences side by side" on GRUB update prompt does not work

[crysman]

Public bug reported:

I've just made an automatic software update. There was a prompt about
what to do with my default grub, because I had modified it a bit. There
was a default option like "install the maintainers version" or similar.

I wanted to see the differences, so I had chosen "show differences side
by side" or so. I clicked next. But to my surprise, nothing happened! No
new window, no anything. Update successful. What?

So I have a look into /etc/default/grub - and it's very same as before
the update.

Where is the problem? :(

PS: Sorry if I've mis-chosen the package

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: ubuntu-release-upgrader-core 1:0.205.2
ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
Uname: Linux 3.11.0-12-generic x86_64
ApportVersion: 2.12.5-0ubuntu2.1
Architecture: amd64
CrashDB: ubuntu
Date: Tue Nov  5 22:18:42 2013
InstallationDate: Installed on 2013-10-26 (10 days ago)
InstallationMedia: Xubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016)
MarkForUpload: True
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: ubuntu-release-upgrader
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade saucy

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https://bugs.launchpad.net/bugs/1248320

Title:
  selecting "show differences side by side" on GRUB update prompt does
  not work

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

Bug description:
  I've just made an automatic software update. There was a prompt about
  what to do with my default grub, because I had modified it a bit.
  There was a default option like "install the maintainers version" or
  similar.

  I wanted to see the differences, so I had chosen "show differences
  side by side" or so. I clicked next. But to my surprise, nothing
  happened! No new window, no anything. Update successful. What?

  So I have a look into /etc/default/grub - and it's very same as before
  the update.

  Where is the problem? :(

  PS: Sorry if I've mis-chosen the package

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: ubuntu-release-upgrader-core 1:0.205.2
  ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
  Uname: Linux 3.11.0-12-generic x86_64
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
  CrashDB: ubuntu
  Date: Tue Nov  5 22:18:42 2013
  InstallationDate: Installed on 2013-10-26 (10 days ago)
  InstallationMedia: Xubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016)
  MarkForUpload: True
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: No upgrade log present (probably fresh install)

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