unity-greeter or any other greeter can not change keyboard layout

[Kirill Shatalaev]

After boot, from login screen , I can not change layout from keyboard by shortcut (ctrl+shift, alt+shift, Caps lock or any other I choose in keyboard settings)

When locking screen by ctrl-alt-L, when I try to press shortcut keys lock screen disappears for a second showing my desktop, and appears again. Layout not changed also.

Using mouse to switch layout via icon working good.

I tried to change greeter (unity-greeter, lightdm-gtk-greeter) whith no effect.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: lightdm 1.18.2-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
Uname: Linux 4.4.0-31-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Jul 26 16:05:37 2016
InstallationDate: Installed on 2016-06-30 (25 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)

[AnrDaemon (anrdaemon)]

I can't say if this bug affecting me, but showing user's screen with such an ease defeats the very purpose of locking the workstation, don't you think?

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.