Comment 4 for bug 752201

As said, there is not a single command associated with 'sudo apt-get install'. This is already a command!
A command to install one or more packages.

If you want to run the commands 'update', 'upgrade', 'dist-upgrade' and/or all the others it's as simple as 'sudo apt-get update', 'sudo apt-get upgrade', 'sudo apt-get dist-upgrade' or alike (note: no 'install' in between).

'sudo apt-get install update' never worked and will never work. The commands you are looking for are most properly 'sudo apt-get update' to update the knowledge of APT about which packages are available and 'sudo apt-get upgrade' to let APT install all updates for your installed packages (which can be installed, but as you say something about held back packages, it seems its not possible for all at the moment).