Language order is wrong at Greeter Screen

Description: Ubuntu 16.04 LTS
Release: 16.04

lightdm:
  Installed: 1.18.1-0ubuntu1
  Candidate: 1.18.1-0ubuntu1
unity-greeter:
  Installed: 16.04.2-0ubuntu1
  Candidate: 16.04.2-0ubuntu1

Current Ubuntu box uses 2 languages, Korean Hangul and Russian, with ibus as an input engine. English is deleted as Korean IM includes English by default.

At login screen language selector should contain independent set of languages with English selected by default. However, instead the selector contains 2 languages: Russian and English, with Russian selected by default. Therefore, typing English password becomes uncomfortable, since it requires manual selection of English language (using mouse).

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: lightdm 1.18.1-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
NonfreeKernelModules: symap_custom_4_4_0_22_generic_x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Jun 8 11:41:44 2016
InstallationDate: Installed on 2016-06-03 (4 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)