Cannot change theme to Radiance in 3.25.x

[Amr Ibrahim]

I cannot find the panel to change the theme to Radiance in the new g-c-c 3.25.x.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: gnome-control-center 1:3.25.92.1-0ubuntu1
ProcVersionSignature: Ubuntu 4.12.0-12.13-generic 4.12.8
Uname: Linux 4.12.0-12-generic x86_64
ApportVersion: 2.20.7-0ubuntu1
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sun Sep 10 19:41:35 2017
ExecutablePath: /usr/bin/gnome-control-center
InstallationDate: Installed on 2017-09-09 (1 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170908)
SourcePackage: gnome-control-center
UpgradeStatus: No upgrade log present (probably fresh install)

[Sebastien Bacher (seb128)]

The theme selector is deprecated and the new theme has no variants

[Amr Ibrahim (amribrahim1987)]

I think there a dark variant of Yaru.

[Sebastien Bacher (seb128)]

It's not shipped at the moment and dark variants are being handled not as different themes but as an option

[Jeremy Bícha (jbicha)]

To rephrase:

GNOME prefers people use the GNOME Tweaks app to change their theme. Currently, the Ubuntu Desktop team agrees enough with GNOME's decision on this issue to not want to try to override it in Ubuntu.