sudo apt-get upgrade
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
The following packages have been kept back:
  python-cupshelpers system-config-printer-gnome
The following packages will be upgraded:
  compiz compiz-core compiz-gnome compiz-plugins compiz-plugins-default
  compiz-plugins-extra compizconfig-settings-manager firefox firefox-locale-en
  flashplugin-installer google-chrome-stable icedtea-7-jre-jamvm
  libcompizconfig0 libdecoration0 libelf1 libelf1:i386 libjasper1
  libjasper1:i386 libmysqlclient18 libnautilus-extension1a
  liboxideqt-qmlplugin liboxideqtcore0 liboxideqtquick0 libpoppler-glib8
  libpoppler44 libsmbclient libwbclient0 mysql-client-5.5
  mysql-client-core-5.5 mysql-common mysql-server mysql-server-5.5
  mysql-server-core-5.5 nautilus nautilus-data openjdk-7-jre-headless
  oxideqt-codecs-extra poppler-utils python-compizconfig python-samba
  python3-software-properties rsyslog samba-common samba-common-bin samba-libs
  smbclient software-properties-common software-properties-gtk
  system-config-printer-common system-config-printer-udev
50 upgraded, 0 newly installed, 0 to remove and 2 not upgraded.
Need to get 0 B/173 MB of archives.
After this operation, 969 kB disk space will be freed.
Do you want to continue? [Y/n] y
Extracting templates from packages: 100%
Preconfiguring packages ...
dpkg: warning: files list file for package 'unity-webapps-service' missing; assuming package has no files currently installed
dpkg: warning: files list file for package 'python3-sip' missing; assuming package has no files currently installed
dpkg: warning: files list file for package 'unity-lens-applications' missing; assuming package has no files currently installed
dpkg: warning: files list file for package 'mysql-common' missing; assuming package has no files currently installed
dpkg: warning: files list file for package 'update-inetd' missing; assuming package has no files currently installed
dpkg: warning: files list file for package 'libgcrypt11:i386' missing; assuming package has no files currently installed
dpkg: warning: files list file for package 'libsox-fmt-alsa:amd64' missing; assuming package has no files currently installed
(Reading databE: Sub-process /usr/bin/dpkg returned an error code (2)