Pressing PRINT SCREEN captures an image of your entire screen and copies it to the Clipboard in your computer's memory. You can then paste (CTRL+V) the image into a document, email message, or other file. Where is the PRINT SCREEN button? The text you see on your keyboard might be PrtSc, PrtScn, or PrntScrn.
How to screenshot to clipboard in Linux?
The default shortcut of Copy screenshot of an area to clipboard is shift + ctrl + print and the default shortcut for copy screenshot to clipboard is ctrl+print.
How to past from Clipboard to Gimp as new Image
You can access this command from the image menu bar through Edit → Paste as → New Image, or using the keyboard shortcut Shift+Ctrl+V .