Ubuntu 12.04 : Not all updates can be installed

Ubuntu 12.04 : Not all updates can be installed

I have ubuntu 12.04 installed on my machine.When I run the update manager
on my machine I get the following message.
I don't know how to fix this issue.Is it safe to run apt-get dist
upgrade.? I am quite happy with Ubuntu 12.04 LTS and not keen on moving to
a newer release.Please advice.
Output of
sudo apt-get update
on command line is given below.
Hit http://mirror.aarnet.edu.au precise Release.gpg
Hit http://mirror.aarnet.edu.au precise-updates Release.gpg
Hit http://mirror.aarnet.edu.au precise-backports Release.gpg
Hit http://mirror.aarnet.edu.au precise-security Release.gpg
Hit http://mirror.aarnet.edu.au precise Release
Hit http://mirror.aarnet.edu.au precise-updates Release
Hit http://mirror.aarnet.edu.au precise-backports Release
Hit http://mirror.aarnet.edu.au precise-security Release
Hit http://mirror.aarnet.edu.au precise/main Sources
Hit http://mirror.aarnet.edu.au precise/restricted Sources
Hit http://mirror.aarnet.edu.au precise/universe Sources
Hit http://mirror.aarnet.edu.au precise/multiverse Sources
Hit http://mirror.aarnet.edu.au precise/main amd64 Packages
Hit http://mirror.aarnet.edu.au precise/restricted amd64 Packages
Hit http://mirror.aarnet.edu.au precise/universe amd64 Packages
Hit http://mirror.aarnet.edu.au precise/multiverse amd64 Packages
Hit http://mirror.aarnet.edu.au precise/main i386 Packages
Hit http://mirror.aarnet.edu.au precise/restricted i386 Packages
Hit http://www.scootersoftware.com stable Release.gpg
Hit http://mirror.aarnet.edu.au precise/universe i386 Packages
Hit http://mirror.aarnet.edu.au precise/multiverse i386 Packages
Hit http://mirror.aarnet.edu.au precise/main TranslationIndex
Hit http://mirror.aarnet.edu.au precise/multiverse TranslationIndex
Hit http://mirror.aarnet.edu.au precise/restricted TranslationIndex
Hit http://mirror.aarnet.edu.au precise/universe TranslationIndex
Hit http://mirror.aarnet.edu.au precise-updates/main Sources
Hit http://mirror.aarnet.edu.au precise-updates/restricted Sources
Hit http://mirror.aarnet.edu.au precise-updates/universe Sources
Hit http://download.virtualbox.org precise Release.gpg
Hit http://mirror.aarnet.edu.au precise-updates/multiverse Sources
Hit http://mirror.aarnet.edu.au precise-updates/main amd64 Packages
Hit http://mirror.aarnet.edu.au precise-updates/restricted amd64 Packages
Hit http://mirror.aarnet.edu.au precise-updates/universe amd64 Packages
Hit http://mirror.aarnet.edu.au precise-updates/multiverse amd64 Packages
Hit http://mirror.aarnet.edu.au precise-updates/main i386 Packages
Hit http://mirror.aarnet.edu.au precise-updates/restricted i386 Packages
Hit http://mirror.aarnet.edu.au precise-updates/universe i386 Packages
Hit http://mirror.aarnet.edu.au precise-updates/multiverse i386 Packages
Hit http://mirror.aarnet.edu.au precise-updates/main TranslationIndex
Hit http://mirror.aarnet.edu.au precise-updates/multiverse TranslationIndex
Hit http://mirror.aarnet.edu.au precise-updates/restricted TranslationIndex
Hit http://mirror.aarnet.edu.au precise-updates/universe TranslationIndex
Hit http://mirror.aarnet.edu.au precise-backports/main Sources
Hit http://mirror.aarnet.edu.au precise-backports/restricted Sources
Hit http://mirror.aarnet.edu.au precise-backports/universe Sources
Hit http://extras.ubuntu.com precise Release.gpg
Hit http://archive.canonical.com precise Release.gpg
Hit http://ppa.launchpad.net precise Release.gpg
Hit http://ppa.launchpad.net precise Release.gpg
Hit http://mirror.aarnet.edu.au precise-backports/multiverse Sources
Hit http://mirror.aarnet.edu.au precise-backports/main amd64 Packages
Hit http://mirror.aarnet.edu.au precise-backports/restricted amd64 Packages
Hit http://mirror.aarnet.edu.au precise-backports/universe amd64 Packages
Hit http://mirror.aarnet.edu.au precise-backports/multiverse amd64 Packages
Hit http://mirror.aarnet.edu.au precise-backports/main i386 Packages
Hit http://mirror.aarnet.edu.au precise-backports/restricted i386 Packages
Hit http://mirror.aarnet.edu.au precise-backports/universe i386 Packages
Hit http://mirror.aarnet.edu.au precise-backports/multiverse i386 Packages
Hit http://mirror.aarnet.edu.au precise-backports/main TranslationIndex
Hit http://mirror.aarnet.edu.au precise-backports/multiverse TranslationIndex
Hit http://download.virtualbox.org precise Release
Hit http://mirror.aarnet.edu.au precise-backports/restricted TranslationIndex
Hit http://mirror.aarnet.edu.au precise-backports/universe TranslationIndex
Hit http://mirror.aarnet.edu.au precise-security/main Sources
Hit http://mirror.aarnet.edu.au precise-security/restricted Sources
Hit http://mirror.aarnet.edu.au precise-security/universe Sources
Hit http://mirror.aarnet.edu.au precise-security/multiverse Sources
Hit http://mirror.aarnet.edu.au precise-security/main amd64 Packages
Hit http://mirror.aarnet.edu.au precise-security/restricted amd64 Packages
Hit http://mirror.aarnet.edu.au precise-security/universe amd64 Packages
Hit http://mirror.aarnet.edu.au precise-security/multiverse amd64 Packages
Hit http://mirror.aarnet.edu.au precise-security/main i386 Packages
Hit http://mirror.aarnet.edu.au precise-security/restricted i386 Packages
Hit http://mirror.aarnet.edu.au precise-security/universe i386 Packages
Hit http://mirror.aarnet.edu.au precise-security/multiverse i386 Packages
Hit http://mirror.aarnet.edu.au precise-security/main TranslationIndex
Hit http://mirror.aarnet.edu.au precise-security/multiverse TranslationIndex
Hit http://mirror.aarnet.edu.au precise-security/restricted TranslationIndex
Hit http://mirror.aarnet.edu.au precise-security/universe TranslationIndex
Hit http://mirror.aarnet.edu.au precise/main Translation-en
Hit http://mirror.aarnet.edu.au precise/multiverse Translation-en
Hit http://www.scootersoftware.com stable Release
Hit http://mirror.aarnet.edu.au precise/restricted Translation-en
Hit http://mirror.aarnet.edu.au precise/universe Translation-en
Hit http://dl.google.com stable Release.gpg
Hit http://extras.ubuntu.com precise Release
Hit http://archive.canonical.com precise Release
Hit http://mirror.aarnet.edu.au precise-updates/main Translation-en
Hit http://mirror.aarnet.edu.au precise-updates/multiverse Translation-en
Hit http://mirror.aarnet.edu.au precise-updates/restricted Translation-en
Hit http://mirror.aarnet.edu.au precise-updates/universe Translation-en
Hit http://mirror.aarnet.edu.au precise-backports/main Translation-en
Hit http://ppa.launchpad.net precise Release
Hit http://mirror.aarnet.edu.au precise-backports/multiverse Translation-en
Hit http://mirror.aarnet.edu.au precise-backports/restricted Translation-en
Hit http://mirror.aarnet.edu.au precise-backports/universe Translation-en
Hit http://mirror.aarnet.edu.au precise-security/main Translation-en
Hit http://download.virtualbox.org precise/contrib amd64 Packages
Hit http://mirror.aarnet.edu.au precise-security/multiverse Translation-en
Hit http://mirror.aarnet.edu.au precise-security/restricted Translation-en
Hit http://mirror.aarnet.edu.au precise-security/universe Translation-en
Hit http://dl.google.com stable Release
Hit http://download.virtualbox.org precise/contrib i386 Packages
Hit http://extras.ubuntu.com precise/main Sources
Hit http://archive.canonical.com precise/partner Sources
Hit http://ppa.launchpad.net precise Release
Hit http://www.scootersoftware.com stable/non-free amd64 Packages
Hit http://dl.google.com stable/main amd64 Packages
Ign http://download.virtualbox.org precise/contrib TranslationIndex
Hit http://dl.google.com stable/main i386 Packages
Hit http://extras.ubuntu.com precise/main amd64 Packages
Hit http://extras.ubuntu.com precise/main i386 Packages
Ign http://extras.ubuntu.com precise/main TranslationIndex
Hit http://archive.canonical.com precise/partner amd64 Packages
Hit http://archive.canonical.com precise/partner i386 Packages
Ign http://archive.canonical.com precise/partner TranslationIndex
Hit http://ppa.launchpad.net precise/main Sources
Hit http://ppa.launchpad.net precise/main amd64 Packages
Hit http://ppa.launchpad.net precise/main i386 Packages
Ign http://ppa.launchpad.net precise/main TranslationIndex
Ign http://dl.google.com stable/main TranslationIndex
Hit http://www.scootersoftware.com stable/non-free i386 Packages
Hit http://ppa.launchpad.net precise/main Sources
Hit http://ppa.launchpad.net precise/main amd64 Packages
Hit http://ppa.launchpad.net precise/main i386 Packages
Ign http://ppa.launchpad.net precise/main TranslationIndex
Ign http://www.scootersoftware.com stable/non-free TranslationIndex
Ign http://download.virtualbox.org precise/contrib Translation-en_NZ
Ign http://dl.google.com stable/main Translation-en_NZ
Ign http://download.virtualbox.org precise/contrib Translation-en
Ign http://dl.google.com stable/main Translation-en
Ign http://extras.ubuntu.com precise/main Translation-en_NZ
Ign http://archive.canonical.com precise/partner Translation-en_NZ
Ign http://extras.ubuntu.com precise/main Translation-en
Ign http://archive.canonical.com precise/partner Translation-en
Ign http://ppa.launchpad.net precise/main Translation-en_NZ
Ign http://ppa.launchpad.net precise/main Translation-en
Ign http://ppa.launchpad.net precise/main Translation-en_NZ
Ign http://ppa.launchpad.net precise/main Translation-en
Ign http://www.scootersoftware.com stable/non-free Translation-en_NZ
Ign http://www.scootersoftware.com stable/non-free Translation-en
Reading package lists...