[Bug 1892014] Re: 18.04.14.7 regression: no alt_shift_toggle in XKBOPTIONS

[Alkis Georgopoulos]

Hi Gunnar, thank you for your input,

> Why is there a need to switch keyboard layout during the installation?

One example is to set the user name, e.g. Διαχειριστής (Administrator).
Another is to be able to surf etc while ubiquity is running in the background.

> As regards post-install, i.e. at first boot/login, the desktop
environment ought to provide some default shortcut for switching input
sources.

By with package? Xorg by itself supports Alt+Shift, and this worked fine
up to 18.04.1, while it broke in 18.04.2, is "plain xkb" now
unsupported? By default, MATE doesn't ship ibus or fcitx, isn't that OK?
I haven't tested in other flavors yet..

`setxkbmap -query` shows the wrong settings now; if one runs `dpkg-
reconfigure keyboard-configuration` after installation, then it works
fine again.

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Title:
  18.04.14.7 regression: no alt_shift_toggle in XKBOPTIONS

Status in ubiquity package in Ubuntu:
  New

Bug description:
  Up to ubuntu-mate-18.04.1.iso, everything was fine. Starting with
  18.04.2, XKB_OPTIONS does not contain "alt_shift_toggle" anymore and
  we cannot switch the keyboard layout to e.g. Greek using Alt+Shift.

  Reading the changelog, I see:

  $ ~/source/ubiquity$ git show 786a5325ef
  +console-setup (1.178ubuntu6) cosmic; urgency=medium
  +
  +  * keyboard-configuration.{config,templates}: There is no good default for
  +    layout toggling, stop pretending there is.  Console users can set one
  +    with dpkg-reconfigure or editing /etc/defaults/keyboard (LP: #1762952)

  I'm guessing that ubiquity duplicates some code from console-setup,
  and LP: #1762952 caused this regression.

  To reproduce:
  1) Start ubuntu-mate-18.04.1-desktop-amd64.iso
  2) Select Ελληνικά (Greek) and start installing Ubuntu using the default options
  3) Right after the keyboard layout step, run:
  $ grep XKBOPTIONS /etc/default/keyboard 
  XKBOPTIONS="grp:alt_shift_toggle,grp_led:scroll"
  4) Verify that you can switch to Greek with Alt+Shift

  Starting from ubuntu-mate-18.04.2-desktop-amd64.iso (.1=OK, .2=BAD), we cannot switch to Greek using Alt+Shift anymore:
  $ grep XKBOPTIONS /etc/default/keyboard 
  XKBOPTIONS="grp_led:scroll"

  Does ubiquity really expect the users to run `dpkg-reconfigure
  console-setup`?

  Note that selecting Greek in the syslinux menu produces the correct
  XKBOPTIONS, yet ubiquity overwrites them later on with the wrong ones.

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