Somehow in my fresh installed ubuntu box, CTRL+SHIFT+C is not copying the selected text, even though the edit menu "Copy" works and says that CTRL+SHIFT+C is bound to copy the selected text.
How can I get CTRL+SHIFT+C working again?
Using xev I found out that the key combination wasn't sending any event at all. Doing some research on my computar model (MSI G72 6QD Dominator), I found out that this was due to a buggy Firmware.
I upgraded my firmware and the problem was fixed.