virtualbox.org

I had 5.0 and unsuccessfully upgraded to 5.2 RC1 and then after some troubleshooting ended up on 5.1, on Ubuntu 16.04 64-bit.
I connect to host via mstsc/xrdp (sessman-Xvnc) and use LXDE.

It used to work more or less fine with v5.0, but with 5.1 (or maybe after some packages were updated, removed, etc.) when I key in anything in VirtualBox UI, keyboard mapping is incorrect. For example if I type "test" in New > Name, it becomes "ngbn", or if I try to type numbers in NAT settings, they're completely different.
Elsewhere (in other apps, in the same session), I can enter text properly. In LXDE's Language Support, it's set to English (same as before), and Keyboard Input Method System is "none" (also same as before; I also tried IBus, didn't help) and both of these I applied System Wide just to be sure - didn't help.

So far VirtualBox is the only app that has this problem. In GUI under Preferences > Language I selected English (built-in) (before with 5.0 Default worked fine, now even English doesn't work).

Any ideas on what else to check?

$ locale
LANG=en_US.utf8
LANGUAGE=en_US:en
LC_CTYPE="en_US.utf8"
LC_NUMERIC=en_US.UTF-8
LC_TIME=en_US.UTF-8
LC_COLLATE="en_US.utf8"
LC_MONETARY=en_US.UTF-8
LC_MESSAGES="en_US.utf8"
LC_PAPER=en_US.UTF-8
LC_NAME=en_US.UTF-8
LC_ADDRESS=en_US.UTF-8
LC_TELEPHONE=en_US.UTF-8
LC_MEASUREMENT=en_US.UTF-8
LC_IDENTIFICATION=en_US.UTF-8
LC_ALL=

I'm on 5.2 now, still seeing the same problem.

How can I tell whether it's MSTSC/XRDP or VB that's causing this problem?

It seems something between VNC and Qt5.... Or something.

https://bugs.debian.org/cgi-bin/bugrepo ... bug=814959

Workaround: now I have to use TightVNC Viewer instead of mstsc/xrdp/Mate.

I'm on 5.2.4 and this is still a problem due to Qt behavior.
I'm affected over both VNC and RDP so either way I can't use VB GUI remotely...