Dark theme not applied in the calendar, system tray and desktop right click menus which are still light

[Guruprasad]

On a fresh installation of Ubuntu Groovy inside a VirtualBox 6.1.16 VM, installed using the latest Groovy ISO and all packages up-to-date, when the dark theme is chosen for the desktop, the calendar, system tray/notification area menu and the desktop right-click menu all still use the light color instead of the expected dark color.

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: gnome-shell 3.38.1-1ubuntu1
ProcVersionSignature: Ubuntu 5.8.0-25.26-generic 5.8.14
Uname: Linux 5.8.0-25-generic x86_64
ApportVersion: 2.20.11-0ubuntu50
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Wed Oct 21 11:42:40 2020
DisplayManager: gdm3
GsettingsChanges:
 b'org.gnome.shell' b'command-history' redacted by apport
 b'org.gnome.desktop.input-sources' b'sources' b"[('xkb', 'us')]"
 b'org.gnome.desktop.interface' b'gtk-im-module' b"'gtk-im-context-simple'"
 b'org.gnome.desktop.interface' b'gtk-theme' b"'Yaru-dark'"
 b'org.gnome.desktop.privacy' b'report-technical-problems' b'true'
InstallationDate: Installed on 2020-10-21 (0 days ago)
InstallationMedia: Ubuntu 20.10 "Groovy Gorilla" - Beta amd64 (20200930)
ProcEnviron:
 LANGUAGE=en_IN:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_IN
 SHELL=/bin/bash
RelatedPackageVersions: mutter-common 3.38.1-1ubuntu1
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

[Guruprasad (lgp171188)]

This appears to be because the changing the theme in the appearance doesn't enable the Yaru dark GNOME shell theme, which has to be manually enabled by following the instructions in https://www.omgubuntu.co.uk/2020/04/enable-full-dark-mode-in-ubuntu-20-04

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1842886, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.