Updagrade problem,synaptic,apt get

When tried to upgrade Synaptics upgrades everything but apt-get wont.Heres the outputs.Shall I report as a bug or is there some other reason to this?Here's the out puts.
Synaptics
icedtea-6-jre-cacao (version 6b17-1.7-1ubuntu1) will be upgraded to version 6b18~pre1-1ubuntu1
icedtea6-plugin (version 6b17-1.7-1ubuntu1) will be upgraded to version 6b18~pre1-1ubuntu1
libnm-glib2 (version 0.8~rc2-0ubuntu1) will be upgraded to version 0.8-0ubuntu1
libnm-util1 (version 0.8~rc2-0ubuntu1) will be upgraded to version 0.8-0ubuntu1
linux-backports-modules-nouveau-lucid-generic (version 2.6.32.13.14) will be upgraded to version 2.6.32.14.15
linux-generic (version 2.6.32.13.14) will be upgraded to version 2.6.32.14.15
linux-headers-generic (version 2.6.32.13.14) will be upgraded to version 2.6.32.14.15
linux-image-generic (version 2.6.32.13.14) will be upgraded to version 2.6.32.14.15
linux-libc-dev (version 2.6.32-14.19) will be upgraded to version 2.6.32-14.20
network-manager (version 0.8~rc2-0ubuntu1) will be upgraded to version 0.8-0ubuntu1
network-manager-gnome (version 0.8~rc2-0ubuntu1) will be upgraded to version 0.8-0ubuntu1
openjdk-6-jre (version 6b17-1.7-1ubuntu1) will be upgraded to version 6b18~pre1-1ubuntu1
openjdk-6-jre-headless (version 6b17-1.7-1ubuntu1) will be upgraded to version 6b18~pre1-1ubuntu1
openjdk-6-jre-lib (version 6b17-1.7-1ubuntu1) will be upgraded to version 6b18~pre1-1ubuntu1
linux-backports-modules-nouveau-2.6.32-14-generic (version 2.6.32-14.3) will be installed
linux-headers-2.6.32-14 (version 2.6.32-14.20) will be installed
linux-headers-2.6.32-14-generic (version 2.6.32-14.20) will be installed
linux-image-2.6.32-14-generic (version 2.6.32-14.20) will be installed

Apt-get
Reading package lists... Done
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages have been kept back:
  gecko-mediaplayer linux-backports-modules-nouveau-lucid-generic
  linux-generic linux-headers-generic linux-image-generic
The following packages will be upgraded:
  icedtea-6-jre-cacao icedtea6-plugin libnm-glib2 libnm-util1 linux-libc-dev
  network-manager network-manager-gnome openjdk-6-jre openjdk-6-jre-headless
  openjdk-6-jre-lib
10 upgraded, 0 newly installed, 0 to remove and 5 not upgraded.
Need to get 35.9MB of archives.
After this operation, 17.0MB of additional disk space will be used.
Do you want to continue [Y/n]?