In 18.04, man shutter
has:
CAPTURE MODE OPTIONS
-s, --select=[X,Y,WIDTH,HEIGHT]
Capture an area of the screen. Providing X,Y,WIDTH,HEIGHT is optional.
In Xubuntu 18.04, to set Control+Shift+PrintScreen as a shortcut to use Shutter
to capture an area of interest, open the Whisker Menu, the icon for which is usually located at the left of your panel, click on Settings
in the right column, and then on Keyboard
in the left column. A window titled Keyboard
opens. In there, click on the Application Shortcuts
tab near the top and then on the Add
button near the lower left (marked in red).
As soon as you click Add
, a smaller window, titled Shortcut Command
, pops up in which you need to type or paste in the command for which you want to assign a keyboard shortcut. In this case, we'll use shutter -s
.
Once you're done entering the command, press the Okay
button near the lower right corner.
Now, another window, Command Shortcut
, appears.
In this one, you need to simultaneously press Control+Shift+PrintScreen and that will be reflected in the window.
Once you release the keys you pressed, that window disappears, the shortcut is established, and you can see it listed. It is functional immediately.