Public bug reported:

This is probably the same as many of the other bug reports already
reported on updating from 14.04 or directly installing 16.04, so after
reading this bug report, feel free to close it.

I have been using Ubuntu LTS for about 10 years now and never had any
serious problems. 16.04 is a total disaster for me.

- Starting from a 14.04 desktop system fully patched and doing a dist-
upgrade fails leaving many uninstalled packages and package conflicts
that I have not been able to fix manually (50-100 packages).  I think I
know all the tricks for installing almost anything, but no go here.

- New Lenovo Yoga 900.  Install 14.04 zero problems. Fully update it.
dist-upgrade. Same results as above.  Note the 14.04 had only Ubuntu
packages and was only about a week old before the dist-upgrade.

- Retry the dist-upgrade on the above.  No go, same problem.

- Do a new upgrade from a USB stick of 16.04 on the above system
containing 14.04 partially upgraded to 16.04 but not working.  It
produced a working 16.04, but destroyed my Windows dual boot, and wiped
out the Windows recovery partition.  This is extremely annoying because
I had not made recovery disks. Once I get new install media and re-
install Windows 10 (beautiful with a nice touch screen even if it is
Windows) I am thinking about sticking to Windows (after 16 years of
using Linux on my laptops this is really bad).

- Do a fresh install of 16.04 on a tower computer.  All goes quite well.
However after doing an apt-get upgrade to get fully patched, then part
way through loading about 100 packages for a developer's setup, I double
click on the Amazon icon, which comes up slowly then totally freezes the
system.  This is much like the black screen syndrome that Windows used
to have -- requires a power off (hold the power button down 10 seconds)!

- Reboot after power off in prior case, and things seem to work until I
double click on the Amazon button and then close the window.  The app
crashes with a webapp-container problem.

Conclusion:
This is not the way to keep happy users.  16.04 is for me unusable.  For the 
first time in a very long time, I am very disappointed.  IMO, 16.04 should be 
considered unstable beta software.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.8
ProcVersionSignature: Ubuntu 3.13.0-87.133-generic 3.13.11-ckt39
Uname: Linux 3.13.0-87-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.21
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: XFCE
Date: Mon Jun  6 16:53:55 2016
InstallationDate: Installed on 2014-12-23 (531 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: dist-upgrade
UpgradeStatus: Upgraded to trusty on 2016-05-16 (21 days ago)
VarLogDistupgradeAptlog:
 Log time: 2016-05-16 09:48:08.557294
 Log time: 2016-05-16 09:48:12.502444

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


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

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https://bugs.launchpad.net/bugs/1589551

Title:
  upgrading from 14.04 to 16.04 or direct install of 16.04 fails

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