Install Crossover Office on Ubuntu Linux

Open a Linux terminal and enter commands in blue.
$ sudo apt-get update; sudo apt-get upgrade <enter>

Install gdebi:
$ sudo apt-get install gdebi <enter>

Download the latest version of CrossOver from

Use gdebi to install CrossOver:
$ sudo gdebi ~/Downloads/crossover_15.1.0-1.deb <enter>
where crossover_15.1.0-1.deb is the latest file downloaded from the above URL.