I am trying to upgrade another Ubuntu server after having done so
successfully on one but I am getting stuck at:

apt-get install libnx-x11
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
libnx-x11 : Depends: libnx-x11-6 (< 2:3.5.0.32-0~668~ubuntu16.04.1.1) but 2:3.5.99.1-0.1+git20160913.1427+16.04.release.1 is to be installed
E: Unable to correct problems, you have held broken packages.

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On Mon, 19 Sep 2016, Mike DePaulo wrote:

Date: Mon, 19 Sep 2016 00:56:08 -0400
From: Mike DePaulo <mikedep...@gmail.com>
To: Robert Dinse <nan...@eskimo.com>
Cc: "x2go-user@lists.x2go.org" <x2go-user@lists.x2go.org>
Subject: Re: Upgrading to nx-libs 3.5.99.1

Hi Robert,

1. I updated the email subject to make it more clear.

2. For those who do not know, this is a reply to Robert's nx-libs
3.5.99.1 upgrade issue as listed in:
http://bugs.x2go.org/cgi-bin/bugreport.cgi?bug=1089

3. Software installer is the wrong tool for the job. "dpkg -i" does
not work with apt repos. It also doesn't handle dependency resolution.

4. To add this apt repo on Ubuntu 16.04, you would create a file with
a name like this:
/etc/apt/sources.list.d/nx-libs-beta.list
("nx-libs-beta" can differ. The folder path and the ".list" extension
must be the same.)
with these contents:
deb http://packages.arctica-project.org/ubuntu xenial main

You also run this command:
wget -qO - http://packages.arctica-project.org/archive.key | sudo apt-key add -

5. To recover your system, I recommend the following:
a. Run `apt-get update`
b. Run `apt-cache search libnx`
c. Uninstall all the libnx packages, such as by running:
sudo apt-get purge <package-list>
Note that this step (or the next one) will result in x2goclient and
x2goserver being uninstalled. That should be OK, see step f.
d. Also remove "nxproxy" if it is still installed.
e. Add the nx-libs 3.5.99.1 repo from #4.
f. Install x2goclient or x2goserver (+ any other client/server
packages.) This should pull in nx-libs 3.5.99.1.

6. For those who are wondering why this upgrade issue can occur when
using "dpkg -i" on all the nx-libs deb packages, it is because nx-libs
3.6 drops many of the X11 libraries that were part of nx-libs 3.5 in
favor of the system's X11 libraries. Thus those library packages no
longer exist, and the entire upgrade process needs to involve removing
those libraries.

-Mike

On Sun, Sep 18, 2016 at 10:12 PM, Robert Dinse <nan...@eskimo.com> wrote:

     I used dpkg -i file, same as the software installer.  I did this
because
the installer blew up and I couldn't see the error.

-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-
 Eskimo North Linux Friendly Internet Access, Shell Accounts, and Hosting.
   Knowledgeable human assistance, not telephone trees or script readers.
 See our web site: http://www.eskimo.com/ (206) 812-0051 or (800) 246-6874.

On Sun, 18 Sep 2016, Mike DePaulo wrote:

Date: Sun, 18 Sep 2016 20:53:32 -0400
From: Mike DePaulo <mikedep...@gmail.com>
To: Robert Dinse <nan...@eskimo.com>
Cc: 1...@bugs.x2go.org, Mike Gabriel <mike.gabr...@das-netzwerkteam.de>
Subject: Re: [X2Go-Dev] Bug#1089: Bug#1089: Bug#1089: x2go Ubuntu 16.04
and
    Fedora 24

Robert,

Debian: deb http://packages.arctica-project.org/ubuntu
{jessie,stretch,sid} main
Ubuntu: deb http://packages.arctica-project.org/ubuntu {trusty,xenial}
main

These are apt repos, and they are meant to used that way, not
installed as downloaded .deb files.

I don't mean to be rude, but could you please start a thread on
x2go-user for help with installing them and recovering your system?

-Mike



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