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

[crysman]

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)

[Brian Murray (brian-murray)]

Were you using a GUI version of the upgrader or a text version?

[crysman (crysman)]

GUI "Software Updater" - it is being invoked automatically...

[Launchpad Janitor (janitor)]

[Expired for ubuntu-release-upgrader (Ubuntu) because there has been no activity for 60 days.]

[Tamás Bitai (tbitai)]

Had the same issue in 18.04.1. From /var/log/dpkg.log this is what seems to be the relevant part:

2018-11-26 10:10:35 status half-configured grub-efi-amd64:amd64 2.02-2ubuntu8.9
2018-11-26 11:14:03 status installed grub-efi-amd64:amd64 2.02-2ubuntu8.9

I was doing something else when prompted about the conflict resolution, then (after about an hour, apparently) I clicked on "view diff" or similar, but nothing happened, the update just went forward.

Difference from the OP is that I don't remember having changed my GRUB config, so it's also a question why I was prompted in the first place.

[Tamás Bitai (tbitai)]

GRUB itself works as expected (can boot into Ubuntu, Windows and system setup).