Kubuntu: Latest updates are keeping back many packages

I am running Kubuntu 14.04 with all the latest updates. However, today when I try to run "sudo apt-get update && sudo apt-get upgrade", I see the following packages kept back:

The following packages have been kept back:
  akregator ark baloo dolphin granatier kaddressbook kate katepart
  kde-baseapps-bin kde-baseapps-data kde-config-pimactivity kde-runtime
  kdepasswd kdepim-kresources kdepim-runtime kdepimlibs-kio-plugins kfind
  kiriki kmail kmix knotes konqueror konqueror-nsplugins konsole kontact
  kopete korganizer ksudoku kwalletmanager libakonadi-calendar4
  libakonadi-contact4 libakonadi-kcal4 libakonadi-kde4 libakonadi-kmime4
  libakonadi-notes4 libakonadi-socialutils4 libbaloocore4 libbaloofiles4
  libbaloopim4 libbalooxapian4 libcalendarsupport4 libeventviews4
  libincidenceeditorsng4 libkabc4 libkactivities-bin libkactivities-models1
  libkactivities6 libkalarmcal2 libkasten2controllers2abi1 libkasten2core2
  libkasten2gui2 libkasten2okteta1controllers1abi1 libkasten2okteta1core1
  libkasten2okteta1gui1 libkateinterfaces4 libkatepartinterfaces4 libkblog4
  libkcal4 libkcalcore4 libkcalutils4 libkcompactdisc4 libkdepim4
  libkdepimdbusinterfaces4 libkdgantt2-0 libkfilemetadata4 libkholidays4
  libkimap4 libkldap4 libkleo4 libkmanagesieve4 libkmbox4 libkmime4
  libkonq-common libkonq5abi1 libkonqsidebarplugin4a libkontactinterface4
  libkopete4 libkpgp4 libkpimidentities4 libkpimtextedit4 libkpimutils4
  libkresources4 libksieve4 libksieveui4 libktnef4 libkxmlrpcclient4
  libmailcommon4 libmailimporter4 libmailtransport4 libmessagecomposer4
  libmessagecore4 libmessagelist4 libmessageviewer4 libmicroblog4
  libnepomukcleaner4 libnepomukcore4abi1 libnoteshared4 libokteta1core1
  libokteta1gui1 libokularcore4 libpimactivity4 libpimcommon4 libsendlater4
  libsyndication4 libtemplateparser4 nepomuk-core-ffmpegextractor
  nepomuk-core-runtime okteta okular okular-extra-backends
  plasma-scriptengine-javascript plasma-widget-folderview
  plasma-widget-lancelot

I have not made any changes to my sources.list (copied below) or added any repositories in months.

# deb cdrom:[Kubuntu 12.04 LTS _Precise Pangolin_ - Release i386 (20120423)]/ precise main restricted

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://us.archive.ubuntu.com/ubuntu/ trusty main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ trusty main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://us.archive.ubuntu.com/ubuntu/ trusty-updates main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ trusty-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://us.archive.ubuntu.com/ubuntu/ trusty universe
deb-src http://us.archive.ubuntu.com/ubuntu/ trusty universe
deb http://us.archive.ubuntu.com/ubuntu/ trusty-updates universe
deb-src http://us.archive.ubuntu.com/ubuntu/ trusty-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://us.archive.ubuntu.com/ubuntu/ trusty multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ trusty multiverse
deb http://us.archive.ubuntu.com/ubuntu/ trusty-updates multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ trusty-updates multiverse

## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://us.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse

deb http://security.ubuntu.com/ubuntu trusty-security main restricted
deb-src http://security.ubuntu.com/ubuntu trusty-security main restricted
deb http://security.ubuntu.com/ubuntu trusty-security universe
deb-src http://security.ubuntu.com/ubuntu trusty-security universe
deb http://security.ubuntu.com/ubuntu trusty-security multiverse
deb-src http://security.ubuntu.com/ubuntu trusty-security multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu precise partner
# deb-src http://archive.canonical.com/ubuntu precise partner

## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
deb http://extras.ubuntu.com/ubuntu trusty main
deb-src http://extras.ubuntu.com/ubuntu trusty main

#Google
# deb http://dl.google.com/linux/deb/ stable non-free main

I'm not sure if I want to run a 'dist-upgrade' as I think that will remove the packages above, which I think would break the system. I've also ran an 'apt-get clean' but it does not fix things.

Does anyone know what might be wrong?