GNOME Flashback (Metacity): Compose Key not working as expected

[Alex N.]

1) The release of Ubuntu you are using, via 'lsb_release -rd' or System -> About Ubuntu

Description: Ubuntu 15.04
Release: 15.04

2) The version of the package you are using, via 'apt-cache policy pkgname' or by checking in Software Center

xorg:
  Installed: 1:7.7+7ubuntu4
  Candidate: 1:7.7+7ubuntu4

3) What you expected to happen

The key combination
AltGr + [ a
produces ä (latin small letter a with diaresis)

Works in GNOME Flashback (Compiz).

4) What happened instead

The key combination
AltGr + [ a
produces ¨a

Does not work in GNOME Flashback (Metacity).

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: xorg 1:7.7+7ubuntu4
ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
Uname: Linux 3.19.0-15-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: GNOME-Flashback:Unity
Date: Sat Apr 25 13:05:09 2015
DistUpgraded: 2015-04-23 21:17:34,692 DEBUG enabling apt cron job
DistroCodename: vivid
DistroVariant: ubuntu
EcryptfsInUse: Yes
ExtraDebuggingInterest: No
GraphicsCard:
 Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0126] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Device [17aa:21da]
InstallationDate: Installed on 2013-10-28 (543 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MachineType: LENOVO 4291NA7
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-15-generic root=UUID=3b21f524-fe80-4ab0-8b84-c03e44abcd8b ro elevator=deadline quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: Upgraded to vivid on 2015-04-23 (1 days ago)
dmi.bios.date: 04/11/2013
dmi.bios.vendor: LENOVO
dmi.bios.version: 8DET68WW (1.38 )
dmi.board.asset.tag: Not Available
dmi.board.name: 4291NA7
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr8DET68WW(1.38):bd04/11/2013:svnLENOVO:pn4291NA7:pvrThinkPadX220:rvnLENOVO:rn4291NA7:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 4291NA7
dmi.product.version: ThinkPad X220
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.12.1+15.04.20150410.1-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.60-2
version.libgl1-mesa-dri: libgl1-mesa-dri 10.5.2-0ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.5.2-0ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.17.1-0ubuntu3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0-1ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917-1~exp1ubuntu2build1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2build1
xserver.bootTime: Sat Apr 25 13:04:39 2015
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id 4204
 vendor AUO
xserver.version: 2:1.17.1-0ubuntu3

[Alex N. (a-nox)]

My setting Keyboard>Shortcuts>Typing>Compose Key is set to "Disabled"

$ aptitude show metacity
Package: metacity
State: installed
Automatically installed: yes
Version: 1:3.14.3-1ubuntu7
Priority: optional
Section: x11
Maintainer: Ubuntu Developers <email address hidden>
Architecture: amd64
Uncompressed Size: 898 k
Depends: adwaita-icon-theme, gsettings-desktop-schemas (>= 3.3.0), metacity-common (= 1:3.14.3-1ubuntu7), zenity, libatk1.0-0 (>= 1.12.4), libc6 (>= 2.14), libcairo2 (>=
         1.10.0), libcanberra-gtk3-0 (>= 0.25), libcanberra0 (>= 0.2), libgdk-pixbuf2.0-0 (>= 2.22.0), libglib2.0-0 (>= 2.37.3), libgtk-3-0 (>= 3.12.0), libgtop2-10 (>=
         2.22.3), libice6 (>= 1:1.0.0), libmetacity-private2 (>= 3.12.0), libpango-1.0-0 (>= 1.14.0), libpangocairo-1.0-0 (>= 1.14.0), libsm6, libstartup-notification0
         (>= 0.7), libx11-6 (>= 2:1.4.99.1), libxcomposite1 (>= 1:0.3-1), libxcursor1 (> 1.1.2), libxdamage1 (>= 1:1.1), libxext6, libxfixes3, libxinerama1, libxrandr2,
         libxrender1
Recommends: gnome-session | x-session-manager, gnome-themes-standard
Suggests: gnome-control-center (>= 1:3.4.0), xdg-user-dirs
Conflicts: metacity
Provides: x-window-manager
Description: lightweight GTK+ window manager
 Metacity is a small window manager, using GTK+ to do everything.

 As the author says, metacity is a "Boring window manager for the adult in you. Many window managers are like Marshmallow Froot Loops; Metacity is like Cheerios."

 This package contains the core binaries.
Homepage: https://git.gnome.org/browse/metacity

[Alberts Muktupāvels (muktupavels)]

Is this still problem in Ubuntu 20.04 or newer?

[Launchpad Janitor (janitor)]

[Expired for metacity (Ubuntu) because there has been no activity for 60 days.]