I'm using Ubuntu 14.04 LTS. When I try to update my system, i get the following error message:

Software Updater – Not all updates can be installed

I googled and some suggested to fix the broken packages using sudo apt-get install -f. But that did not work for me.

When I use apt-get upgrade this is the message I receive:

Reading package lists...
Building dependency tree...
Reading state information...
The following packages have been kept back:
  gir1.2-rb-3.0 gir1.2-totem-1.0 librhythmbox-core8 libtotem-plparser18 libva1
  libvlc5 libvncserver0 linux-generic-lts-utopic
  linux-headers-generic-lts-utopic linux-image-generic-lts-utopic rhythmbox
  rhythmbox-data rhythmbox-mozilla rhythmbox-plugin-cdrecorder
  rhythmbox-plugin-magnatune rhythmbox-plugins smplayer smplayer-themes totem
  totem-common totem-mozilla totem-plugins vlc vlc-data vlc-nox
  vlc-plugin-libde265 vlc-plugin-notify vlc-plugin-pulse
The following packages will be upgraded:
  google-chrome-stable mkvtoolnix mkvtoolnix-gui
3 upgraded, 0 newly installed, 0 to remove and 28 not upgraded.
Need to get 53.3 MB of archives.
After this operation, 6,539 kB disk space will be freed.
Do you want to continue? [Y/n] Abort.

What i don't get is why the linux kernel image has the name linux-image-generic-lts-utopic(Why does it contain the word utopic, even though the code name is trusty)? I also looked at the /etc/apt/sources.list. There is no occurrence of the word utopic in it.

Things I have tried

1. Fix Broken Packages using apt-get install -f
2. The commands :
   apt-get autoremove && apt-get clean && apt-get update

What can i do to make the System Updater to work normal? Thanks in advance