For God's sake, why isn't there an app for this that doesn't require the use of a terminal?
Assumptions much?
Who said there isn't an app for this that doesn't require the use of a terminal?
Of course there is, or are..
There are lots..
Ubuntu and Mint (and other variants) almost always come with System Monitor, ether enabled or easy to enable (left click on the taskbar and add the applet).
Select the "Processes" tab. Select the process and end it.
Although there are lots of fun command line options also.
One of my favorites was always xkill.
Type that into a terminal (or you could put an icon on your desktop for it if you want, but it's not needed very often, so I don't bother).
Then your cursor becomes and X and you can kill any process (window) by clicking on it.. Great fun!! :-)
desiv