I have recently installed the i3 tiling window manager  on my Ubuntu system and I'm trying to figure out how to copy & paste between various terminal and application windows.
How can this be done?
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Some terminals use
CTRL+SHIFT+V to copy and paste, while others use
urxvt (See https://wiki.archlinux.org/index.php/Rxvt-unicode#Cut_and_paste ).
i3wm, try using a clipboard manager, like
sudo apt-get update sudo apt-get install clipit
exec --no-startup-id clipit to
~/.i3/config to start it automatically.
You have had good answers above, I will just add a detail. As a default, the clipboard of each container is emptied when the container is closed. So if you copy some text from a terminal, close the terminal, and paste the text in another terminal - it will not work, because the clipboard will have been emptied in the meanwhile.
I just got mine done by holding down Ctrl+
mouse wheel. Then selecting from the popup that comes the option:
Select to clipboard by moving the mouse to that option and releasing the mouse wheel. Then I went ahead and selected the text I wanted to copy in the terminal and it worked.
This was done in i3 wm