ubuntu 18.04.2

oh, and i took those three steps in your reply and still don't know the command to make it run

ok, i'm a new guy to ubuntu.  i'm trying to download and install bfgminer, but all sources related to ubuntu are problematic.  i'm using synaptic for finding and installing programs but when i try to follow the installed programs list, i am having trouble locating an executable file of any sort to run the program.  so i've used synaptic to uninstall and reinstall the program a couple times and anything that has looked like an executable file i've clicked and bfg hasn't started yet.  i've gone to youtube, help.ubuntu.com/community/ExternalGuides, google, and i'm not getting the software to run.