package gconf2-common 3.2.6-3ubuntu7 failed to install/upgrade: subprocess installed post-installation script returned error exit status 128

[jorma nieminen]

just trying to change my boot order.
Bug happened when running literally:

1.fgrep menuentry /boot/grub/grub.cfg
- this was ok and outputs the cfg file contents on screen
2. gksu edit /etc/default/grub
- results in
The program 'gksu' is currently not installed. You can install it by typing:
sudo apt install gksu
3. sudo apt install gksu
- asks password (ofc)
output is the following 2 lines beginning with E:
E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?

*might* have to do with the fact that firefox plugins wont install, and also chrome install hangs at 51% when installing from "Ubuntu Software"
The error with FF is identical with complaining about the administration directory, but chrome just silently hangs there.....

My install is quite default ubuntu latest i guess 17.04 x64. tbh i did not change anything but kb and regional settings while installing.

lsb:
Description: Ubuntu 17.04
Release: 17.04

apt-cache policy gconf:
gconf:
  Installed: (none)
  Candidate: (none)
  Version table:

what i expected to happen:
apt download and install of gksu (which i don't know what it is some editor i guess)
what happened:
the same 2 E: lines that I get in the other mentioned situations.

note: I don't know if this is a bug as such. I mean maybe, I guess (never having gui installed linux before, I've been windows / apple since 90's) gconf is missing from the install package?
So kind of not a bug but a packaging issue maybe, I don't know how ubuntu is structured in regards to ALM, if this were a software with multiple components I would guess all the builds are ok but the output copy failed for that part? I am just a .net dev / architect so this is a guess. But if this were microsoft server app X, then we're talking a missing dll / component from the distribution image.

As it might be pertinent,install was done by rufus (2.11) just making a bootable usb stick from:
ubuntu-17.04-desktop-amd64.iso
which was downloaded a few days ago from the offical main page.

I won't bother doing the DebuggingProcedures, as my personal guess is that debugging software that does not exist on this install is not technically feasible.
I will also not try to update manually or anything, in case someone wants to take a remote gander at the situation, or require more info which would be lost in case I change something.

ProblemType: Package
DistroRelease: Ubuntu 17.04
Package: gconf2-common 3.2.6-3ubuntu7
ProcVersionSignature: Ubuntu 4.10.0-21.23-generic 4.10.11
Uname: Linux 4.10.0-21-generic x86_64
ApportVersion: 2.20.4-0ubuntu4.1
Architecture: amd64
Date: Tue May 30 14:01:58 2017
ErrorMessage: subprocess installed post-installation script returned error exit status 128
InstallationDate: Installed on 2017-05-29 (1 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
PackageArchitecture: all
RelatedPackageVersions:
 dpkg 1.18.10ubuntu2
 apt 1.4
SourcePackage: gconf
Title: package gconf2-common 3.2.6-3ubuntu7 failed to install/upgrade: subprocess installed post-installation script returned error exit status 128
UpgradeStatus: No upgrade log present (probably fresh install)

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #1688721, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.