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There is a remote Windows 10 computer that I access through TeamViewer from my local Debian 8. Everything works fine. On the remote Windows machine I launch a VirtualBox VM with Linux (Debian 9) inside. Once I try to type something in the VM window some keys do not work. For instance numbers work, uppercase letters work (when I use SHIFT or CAPS LOCK), however lowercase letters just don't work. Why? Mouse works without problems inside and outside of the VM window.
Lowercase doesn’t work, but you indicated, uppercase does when shift is used. So nothing is typed when shift isn’t pressed? Sounds like a TeamViewer problem to me. What if you connect TeamViewer to the VM and connect directly to it? – Ramhound – 2018-03-15T22:43:29.910