How to update a single package in ubuntu/kubuntu

In order to update a single package using the CLI: you need to add the option '--only-upgrade install'

sudo apt-get --only-upgrade install <packagename>

e.g., sudo apt-get --only-upgrade install ack

Reading package lists... Done
Building dependency tree      
Reading state information... Done
Skipping **ack**, it is not installed and only upgrades are requested.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.