Public bug reported:

was running ubuntu 14.04.1, with gnome (cinnamon installed over gnome about 
year and half ago)
graphics card is Nvidia Corp GF108 [GeForce GT620] rev a1 with the nvidia 304 
driver

Responded to upgrade manager prompt to upgrade to ubuntu 16/04.1

After checking found that most folks with Nvidia problems had them in June/July 
2016,
so figured problems had been resolved. (Boy, was I wrong!)

Have spent the the last 5-days 8-10 hours a day, trying to recover from
this badly packaged upgrade. It took two days to get "past" the
inability to logon at all, and was finally able to make use of ctl-
alt-F3 to get a terminal session during the logon loop problem of
lightdm and Nvidia video drivers after trying damn near every NVIDIA
video driver since 304.

This was done using ppa:graphics-drivers and always doing a "sudo apt-
get-purge nvida-*" before the "sudo apt-get install nvidia-xxx".
Initially I tried nvidia-367 and it did not work. Eventually, however,
the nvidia 367.35 did work with gdm3, but not with lightdm.

I do not understand why Nemo is "not installed" as that was the software
package that I used the most (other then "apt-get" and "dpkg") during my
tty debugging sessions, once I could actually establish a tty session.

Amongst many other changes that was made while trying to resolve the entire 
upgrade to Ubuntu 16.04.1 Gnome, was that I installed cinnamon 3 and then 
uninstalled it...
...this eliminated a lot of wierd error messages. (Sorry, don't remember what 
they were.)

Eventually I installed gnome 3.20 using its special ppa and when that
did not work, I did a new install of "gnome" and "gnome-shell". After I
did yet another  "sudo dpkg-reconfigure gdm3" and for the first time in
5-days I was able to logon with a Graphics Manager.

Upon login, I received a message that the "nemo 2.8.6-2" installation
had failed, and thus this ticket...


If anybody wants to try and figure out what the original root cause for the 
ubuntu 16.04.1 gnome installation failure really was, please list what command 
output and or logs you would like to see and I will be glad to attach them to 
this ticket. While I am knowledgable and comfortable with Linux, I am not an 
expert. (I retired 10-years ago from a lifetime of supporting very large IBM 
Mainframes at multiple locations and networking them with many, many different 
minicomputer and microcomputer hardware systems and their respective operating 
systems in both workstation and server configurations.)

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: nemo (not installed)
ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15
Uname: Linux 4.4.0-34-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
Date: Tue Aug 23 13:28:57 2016
DuplicateSignature:
 package:nemo:(not installed)
 Unpacking nemo (2.8.6-2) over (3.0.6-1~xenial0) ...
 dpkg: error processing archive /var/cache/apt/archives/nemo_2.8.6-2_amd64.deb 
(--unpack):
  trying to overwrite '/usr/share/polkit-1/actions/org.nemo.root.policy', which 
is also in package nemo-data 3.0.6-1~xenial0
ErrorMessage: trying to overwrite 
'/usr/share/polkit-1/actions/org.nemo.root.policy', which is also in package 
nemo-data 3.0.6-1~xenial0
InstallationDate: Installed on 2014-05-11 (836 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt  1.2.12~ubuntu16.04.1
SourcePackage: nemo
Title: package nemo (not installed) failed to install/upgrade: trying to 
overwrite '/usr/share/polkit-1/actions/org.nemo.root.policy', which is also in 
package nemo-data 3.0.6-1~xenial0
UpgradeStatus: Upgraded to xenial on 2016-08-19 (4 days ago)

** Affects: nemo (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-package package-conflict xenial

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https://bugs.launchpad.net/bugs/1616296

Title:
  package nemo (not installed) failed to install/upgrade: trying to
  overwrite '/usr/share/polkit-1/actions/org.nemo.root.policy', which is
  also in package nemo-data 3.0.6-1~xenial0

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