Q. I have latest version of Ubuntu Linux. How do I update Ubuntu Linux for security and application fix or upgrades?A. Ubuntu Linux can be upgraded using GUI tools or using traditional command line tools.Using apt-get command line toolapt-get is the command-line tool for handling packages. You can use following command options:=> apt-get update : Update is used to resynchronize the package index files from their sources via Internet.=> apt-get install package-name : install is followed by one or more packages desired for installation. If package is already installed it will try to update to latest version.a) Open terminal and type following two commands (Application > Accessories > Terminal):b) Get update software list, enter:tukulesto:~# sudo apt-get updatec) Update software(s)...