Ubiquity does not set "Switching to another layout" shortcut for secondary language

[Norbert]

Steps to reproduce:
1. Start Ubuntu MATE 20.04 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"
XKBVARIANT=""
XKBOPTIONS=""

BACKSPACE="guess"

```

so the Russian keyboard layout were not added.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubiquity (not installed)
ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
Uname: Linux 5.4.0-21-generic x86_64
ApportVersion: 2.20.11-0ubuntu21
Architecture: amd64
CurrentDesktop: MATE
Date: Wed Apr 1 23:17:00 2020
InstallCmdLine: file=/cdrom/preseed/ubuntu-mate.seed initrd=/casper/initrd quiet splash --- maybe-ubiquity
InstallationDate: Installed on 2020-04-01 (0 days ago)
InstallationMedia: Ubuntu-MATE 20.04 LTS "Focal Fossa" - Beta amd64 (20200401)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Norbert (nrbrtx)]

Second time the installed system have `ru` and `us` layouts, but the <Alt>+<Shift> is not defined.

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 keyboard layout switcher is not defined here.

There is something wrong with keyboard layout settings by installer.

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1870219

[Launchpad Janitor (janitor)]

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

[Norbert (nrbrtx)]

Exists in beta. Language used does not really matter.

[Norbert (nrbrtx)]

For Xubuntu the results are worse - keyboard layout switcher applet after adding does not detect `ru` / Russian language which is defined in `/etc/default/keyboard`.

[Simon Quigley (tsimonq2)]

Thank you for taking the time to submit this bug report. Ubiquity is now unmaintained, and is replaced by either the Ubuntu Desktop Inser or Calamares starting with Ubuntu 24.04 LTS. Therefore, this bug is being closed as Won't Fix. If you believe this was done in error, feel free to re-open the bug. If yave any general questions about Ubuntu, please open a topic on the Ubuntu Discourse instance: https://discourse.ubuntu.com/