I have team viewer set up with Linux Mint on the viewer computer and raspbian linux on the remote (server) computer. I can use ctrl key combinations on the viewer computer but it won't register on the remote computer. If I connect directly to it (with keyboard and monitor) then I can use ctrl key. I've tried the obvious ctrl+shift and that doesn't work. It makes teamviewer of limited use in controlling the headless pi.
Grateful for any suggestions / fixes.