This is getting really problematic: I also observed the issue on the
base machine, not only within virtualbox guest. The effect there is in
most cases that an open login session remains on tty1, that contains the
passwords in plaintext in some .vim file. Cause:

During double command execution, quite some commands work even when
executed twice, e.g. "ls". Since graphical desktop contains multiple
xterms, but all commands on tty1 are executed in one shell, thus some
combinations do not make sense any more (e.g. the GUI combination
xterm1: "cd tmp"; xterm2: "su -s /bin/bash \n dhclient eth0\n cd \";
xterm1: "rm -rf -- *" might be the most lethal leading to complete data
loss).

On my machine, quite some events ended with vim open on tty1 in some
exotic mode. When I lock the graphical desktop and leave the machine,
tty1 will be still open to anyone who knows about the problem and vim
might contain username/password or sudo/ssh-keypassphrases in plaintext
in vim edit mode.

Workaround (has worked so far):

Press [Ctrl]-C on xdm login screen, this restarts xdm. Afterwards
tty1/tty7 are uncoupled.

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https://bugs.launchpad.net/bugs/782171

Title:
  Keyboard input processed twice, both on vt1 and vt7

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