Keyboard > Shortcuts Typing > Alternative Characters Key set to Caps Lock disables Caps Lock without enabling alternative characters

[NoBugs]

Keyboard > Shortcuts Typing > Alternative Characters Key set to Caps Lock disables Caps Lock without enabling alternative characters, tried this without good results in 15.10, but I found out about this problem on askubuntu with user of 14.04 encountered this problem first.

After setting Alternative Characters Key to Caps Lock, Caps Lock does not help to write alternative characters and it is disabled from functioning normally.

unity-control-center:
  Installed: 15.04.0+15.10.20150923-0ubuntu1
  Candidate: 15.04.0+15.10.20150923-0ubuntu1
  Version table:
 *** 15.04.0+15.10.20150923-0ubuntu1 0
        500 http://sk.archive.ubuntu.com/ubuntu/ wily/main amd64 Packages
        100 /var/lib/dpkg/status

Expected to be able to write alternative characters after pressing Caps Lock.
Instead Caps Lock is not responsive.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: unity-control-center 15.04.0+15.10.20150923-0ubuntu1
ProcVersionSignature: Ubuntu 4.2.0-21.25-generic 4.2.6
Uname: Linux 4.2.0-21-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CurrentDesktop: Unity
Date: Sun Dec 20 12:07:03 2015
ExecutablePath: /usr/bin/unity-control-center
InstallationDate: Installed on 2015-11-04 (45 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
JournalErrors:
 No journal files were found.
 -- No entries --
SourcePackage: unity-control-center
UpgradeStatus: No upgrade log present (probably fresh install)