This bug made using emacs and IntelliJ Idea a nuisance. I found a simple 
workaround.
0
=1=

You can verify how ALT and SHIFT are not being detected simultaneously by 
running
$ xkbwatch

Notice how the blinky lights change for ALT and for SHIFT but not for
both at the same time.

=2=

$ setxkbmap -query
rules:      evdev
model:      pc105
layout:     us,us,us
variant:    ,intl,
options:    grp:alt_shift_toggle,grp_led:scroll
            ^^^^^^^^^^^^^^^^^^^^
            THIS IS THE PROBLEM

=3=

We will now unset ALT-SHIFT toggle.

$ setxkbmap -option -option grp_led:scroll
            ^^^^^^^
            DELIBERATELY EMPTY

The first empty -option erases all options, the second one just carries
over an option we want to keep. Additional -option clauses can preserve
other preexisting options.

I can still change to next/previous input source with whatever is
configured in Settings/Keyboard/Typing

=4=

Do step =2= again and notice how ALT and SHIFT now play together
simultaneously.

I am now a happy Emacs and IntelliJ user. This is a single command
workaround.

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to console-setup in Ubuntu.
https://bugs.launchpad.net/bugs/1762952

Title:
  Alternative shortcut for layout switching Alt+Shift unexpectedly set
  by default

Status in console-setup package in Ubuntu:
  Fix Released
Status in gnome-control-center package in Ubuntu:
  Invalid
Status in console-setup source package in Bionic:
  Fix Released
Status in gnome-control-center source package in Bionic:
  Invalid

Bug description:
  [Impact]

  The keyboard-configuration package provides a tool for configuring the
  keyboard via /etc/default/keyboard. However, there are desktop GUIs
  which provide such tools as well, and in the case of gnome-control-
  center it has another idea of what /etc/default/keyboard should
  contain. In short: The different tools don't play well together.

  The proposed upload does not claim to fix all issues with this
  incompatibility. But one of the annoyances is that a pure upgrade of
  the keyboard-configuration package may result in a changed keyboard
  configuration without the user asking for it. The proposed upload does
  address that particular issue on desktop systems.

  [Test Case]

  1. On an Ubuntu 18.04 system, make sure that the contents of
     /etc/default/keyboard is 'the g-c-c style', for instance:

     XKBLAYOUT=se,us
     BACKSPACE=guess
     XKBVARIANT=,

  2. Reboot.

  3. Upgrade to the version of the keyboard-configuration package in
     bionic-proposed.

  => Find that /etc/default/keyboard was not changed through the
  upgrade.

  4. Run the command

     sudo dpkg-reconfigure keyboard-configuration

  => Find that you are now offered to change your keyboard
  configuration.

  [Regression Potential]

  As a result of this upload, and unlike before, no keyboard
  configuration will happen behind the scenes on a desktop system due to
  an upgrade of the keyboard-configuration package. This is the desired
  change, and I can't think of a case when a user would want the
  configuration to be changed without having asked for it.

  [Original description]

  Version: Ubuntu 18.04 Final Beta with default Gnome Shell included in
  18.04

  Steps to reproduce:
  1. Define two keyboard input methods in Settings -> Region & Language -> 
Input Sources
  2. Open several applications
  3. Observe that application windows can be iterated with Alt + Tab
  4. Once application window iteration was begun with Alt + Tab, try to iterate 
backwards with Alt + Shift + Tab.
  5. Try to change keyboard input method switching hotkeys in Settings -> 
Region & Language -> Input Sources -> Options.
  6. Observe that Keyboard shortcut for "Alternative switch to next source" is 
set to "Alt + Shift" and that keyboard shortcuts can only be changed in 
Settings -> Devices -> Keyboard -> Keyboard Shortcuts.
  7. Observe that the shortcut for "Alternative switch to next source" is not 
available for configuration in Settings -> Devices -> Keyboard -> Keyboard 
Shortcuts.

  Actual state:
  * Performing step 4 does not select the previous app in application switcher 
but instead changes  keyboard input method.

  Expected state:
  * The shortcut for "Alternative switch to next source" can be changed and / 
or deactivated in Settings -> Devices -> Keyboard -> Keyboard Shortcuts.

  Notes:
  * The above was working fine in Ubuntu 17.10. I assume "Alternative switch to 
next source" did not exist in that version of Gnome Shell.

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