When trying to Install a Splunk forwarder on Linux, why am I getting the following error: 'splunk: command not found'

I am trying to install the Splunk forwarder (for Splunk Cloud) on an Ubuntu 16.04 server using the instructions on the following: https://docs.splunk.com/Documentation/SplunkCloud/7.2.3/User/ForwardDataToSplunkCloudFromLinux Everything seems to go well until I get to Step 3: Download and install the universal forwarder credentials. When I type in the command to install the .spl file, I keep getting the 'splunk: command not found' error message. Does anybody know why I this is happening?