[Bug 1983457] [NEW] [Boxes] The installer crashes when installing with `Express Installation ON` in `Boxes` when a Japanese Keyboard is connected.

[ichro furuya]

Public bug reported:

### situation:

I have a Japanese Keyboard connected to my PC. Launched the `Boxes` app.
I chose `Ubuntu 20.10 x86_64(live)` and installed with `Express
Installation: ON`.

I answered `Yes` to the question `Are you sure you want to keep the
default keyboard layout (ja)?`. About the time the installation
progressed and reached the `keyboard settings`, the installer crashed.


### usage environment:

Host OS: xubuntu 20.04.4 LTS(Japanese environment):

```
$ uname -r
5.15.0-41-generic
```

Boxes version: 42.3-17184268

```
$ flatpak list
:
Boxes  org.gnome.Boxes  42.3  stable system
```

### If checked after installation:

```
$ hostnamectl
:
Architecture: x86-64
Hardware Vender: QEMU
Hardware Model: Standard PC_Q35 + ICH9,2009_

$ localectl
System Locale: LANG-ja_JP.UTF-8
VC Keymap: n/a
X11 Layout: jp
X11 Model: pc105
```

### Frequency of occurrence:

always

ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: ubiquity 21.10.10
ProcVersionSignature: Ubuntu 5.13.0-19.19-generic 5.13.14
Uname: Linux 5.13.0-19-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu70
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.465
CurrentDesktop: ubuntu:GNOME
Date: Wed Aug  3 17:50:38 2022
InstallCmdLine: file=/preseed.cfg locale=ja keyboard-configuration/layoutcode=ja hostname=ubuntu2110-2 priority=critical console-setup/ask_detect=false domain=unassigned-domain interface=auto noprompt boot=casper automatic-ubiquity
LiveMediaBuild: Ubuntu 21.10 "Impish Indri" - Release amd64 (20211012)
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=ja_JP.UTF-8
 LC_NUMERIC=C.UTF-8
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug impish ubiquity-21.10.10

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https://bugs.launchpad.net/bugs/1983457

Title:
  [Boxes] The installer crashes when installing with `Express
  Installation ON` in `Boxes` when a Japanese Keyboard is connected.

Status in ubiquity package in Ubuntu:
  New

Bug description:
  ### situation:

  I have a Japanese Keyboard connected to my PC. Launched the `Boxes`
  app. I chose `Ubuntu 20.10 x86_64(live)` and installed with `Express
  Installation: ON`.

  I answered `Yes` to the question `Are you sure you want to keep the
  default keyboard layout (ja)?`. About the time the installation
  progressed and reached the `keyboard settings`, the installer crashed.

  
  ### usage environment:

  Host OS: xubuntu 20.04.4 LTS(Japanese environment):

  ```
  $ uname -r
  5.15.0-41-generic
  ```

  Boxes version: 42.3-17184268

  ```
  $ flatpak list
  :
  Boxes  org.gnome.Boxes  42.3  stable system
  ```

  ### If checked after installation:

  ```
  $ hostnamectl
  :
  Architecture: x86-64
  Hardware Vender: QEMU
  Hardware Model: Standard PC_Q35 + ICH9,2009_

  $ localectl
  System Locale: LANG-ja_JP.UTF-8
  VC Keymap: n/a
  X11 Layout: jp
  X11 Model: pc105
  ```

  ### Frequency of occurrence:

  always

  ProblemType: Bug
  DistroRelease: Ubuntu 21.10
  Package: ubiquity 21.10.10
  ProcVersionSignature: Ubuntu 5.13.0-19.19-generic 5.13.14
  Uname: Linux 5.13.0-19-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu70
  Architecture: amd64
  CasperMD5CheckResult: pass
  CasperVersion: 1.465
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Aug  3 17:50:38 2022
  InstallCmdLine: file=/preseed.cfg locale=ja keyboard-configuration/layoutcode=ja hostname=ubuntu2110-2 priority=critical console-setup/ask_detect=false domain=unassigned-domain interface=auto noprompt boot=casper automatic-ubiquity
  LiveMediaBuild: Ubuntu 21.10 "Impish Indri" - Release amd64 (20211012)
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=ja_JP.UTF-8
   LC_NUMERIC=C.UTF-8
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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