Wouldn't complete Ubuntu 15.04 upgrade from 14.04 LTS.

[Gary Krueger]

First sign of a problem is when it says:

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Third party sources disabled

Some third party entries in your sources.list were disabled. You can re-enable them after the upgrade with the 'software-properties' tool or your package manager.
                                                                  [Close]
==================================

Then it reported:

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Can't install 'ubuntu-desktop'

It was impossible to install a required package. Please report this as a bug using 'ubuntu-release-upgrader-core' in a terminal.
                                                                [Close]
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Then, it said:

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Error authenticating some packages

It was not possible to authenticate some packages. This may be a transient network problem. You may want to try again later. See below for a list of unauthenticated packages.
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enblend
gettext
inkscape
libatomic1
libfftw3-double3
libfftw3-single3
libgfortran3
libgomp1
libitm1
libkexiv2-11
libquadmath0
libstdc++6
libstdc++6:i386
libtsan0
onboard
--------------------------------------------------
                                               [Close]
=================================================

I decided to upgrade to 15.04, as the trackpointer stopped working for me. Via some configuration changes, I was able to get the trackpointer working. But, now the incessantly irritating trackpad cannot be turned off, and causes the pointer to jump about the screen wildly while typing, randomly selecting arbitrary stuff. It is now essentially unusable!

No solution seems to fix this. And, now I see that I cannot upgrade!

For now, I am using aluminum foil in a feeble attempt to block the crummy trackpad.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.8
ProcVersionSignature: Ubuntu 3.16.0-57.77~14.04.1-generic 3.16.7-ckt20
Uname: Linux 3.16.0-57-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Sun Jan 17 16:27:33 2016
InstallationDate: Installed on 2015-03-12 (311 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2016-01-17 (0 days ago)
VarLogDistupgradeTermlog:

mtime.conffile..etc.update.manager.release.upgrades: 2016-01-17T15:27:30.954592

[Brian Murray (brian-murray)]

From Mainlog.txt we can see the following:

2016-01-17 16:26:58,897 DEBUG plugins for condition 'from_trustyPostDistUpgradeCache' are '[]'
2016-01-17 16:26:58,898 DEBUG none of the '['ubuntu-desktop', 'kubuntu-desktop', 'xubuntu-core', 'xubuntu-desktop', 'ubuntustudio-desktop', 'mythbuntu-desktop', 'kubuntu-netbook', 'lubuntu-core', 'lubuntu-desktop', 'ubuntu-gnome-desktop']' meta-pkgs installed
2016-01-17 16:26:58,899 DEBUG guessing 'ubuntu-desktop' as missing meta-pkg
2016-01-17 16:27:01,736 ERROR failed to mark 'ubuntu-desktop' for install (E:Unable to correct problems, you have held broken packages.)

Please try installing one of the supported meta-pkgs and see if the upgrade can be calculated after that. Thanks in advance.

[Brian Murray (brian-murray)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1534374, so it 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.