Cannot copy from ubuntu terminal (not a shortcut misunderstanding)

I recently installed Ubuntu 17.10 Desktop on a new machine and am having some trouble with the terminal which is turning out to be way more annoying than I expected. I can’t copy highlighted text, not with the Ctrl+Shift+C shortcut or with a right-click and “copy”. Neither of these seem to do anything at all, as the clipboard retains the previously copied text. This is the first time I have encountered this problem with Ubuntu.