[Bug 1891070] Re: Ubiquity does not set "Switching to another layout" shortcut for secondary language (18.04 LTS)

[Norbert]

Ubuntu MATE 16.04 LTS (now EOL) sets "grp:alt_shift_toggle" correctly.

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https://bugs.launchpad.net/bugs/1891070

Title:
  Ubiquity does not set "Switching to another layout" shortcut for
  secondary language (18.04 LTS)

Status in ubiquity package in Ubuntu:
  New

Bug description:
  Steps to reproduce:
  1. Start Ubuntu MATE 18.04.5 LTS installer
  2. Specify Russian language on the first page of installer
  3. Wait installer to finish

  Expected results:
  * the keyboard layout switcher shows two layouts - *en* and *ru*, reacts on <Alt>+<Shift> hotkey

  Actual results:
  * the keyboard layout switcher is not shown, does not react on <Alt>+<Shift> hotkey

  Note: the contents of keyboard configuration files is the following:

  ```
  $ cat /etc/default/keyboard 
  # KEYBOARD CONFIGURATION FILE

  # Consult the keyboard(5) manual page.

  XKBMODEL="pc105"
  XKBLAYOUT="us,ru"
  XKBVARIANT=","
  XKBOPTIONS="grp_led:scroll"

  BACKSPACE="guess"

  
  ```

  so the Russian keyboard layout was added, but <Alt>+<Shift> is not
  defined.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubiquity (not installed)
  ProcVersionSignature: Ubuntu 5.4.0-42.46~18.04.1-generic 5.4.44
  Uname: Linux 5.4.0-42-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.16
  Architecture: amd64
  CurrentDesktop: MATE
  Date: Mon Aug 10 21:04:09 2020
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu-mate.seed boot=casper only-ubiquity quiet splash ---
  InstallationDate: Installed on 2020-08-10 (0 days ago)
  InstallationMedia: Ubuntu-MATE 18.04.5 LTS "Bionic Beaver" - Release amd64 (20200806.1)
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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