I want to update my Ubuntu 14.04 system from the terminal and I know that sudo apt-get update && sudo apt-get upgrade are the commands but when I check the update manager kernel updates are still there. Why? and what can I do to update the kernel from terminal.

Best Answer

You need to perform dist-upgrade inorder to install/remove all dependencies related to the packages upgraded using upgrade . From the manual page of apt-get .

  dist-upgrade
       dist-upgrade in addition to performing the function of
       upgrade, also intelligently handles changing dependencies
       with new versions of packages; apt-get has a "smart"
       conflict resolution system, and it will attempt to upgrade
       the most important packages at the expense of less
       important ones if necessary. The dist-upgrade command may
       therefore remove some packages. The /etc/apt/sources.list
       file contains a list of locations from which to retrieve
       desired package files. See also apt_preferences(5) for a
       mechanism for overriding the general settings for
       individual packages.

The better way would be to upgrade

sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade

However, be careful while using dist-upgrade as it might also remove packages to satisfy dependencies.