[Bug 1883438] Re: Gtk theme link_color is not beeing used

[123]

** Attachment added: "after-patch.png"
   https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1883438/+attachment/5635455/+files/after-patch.png

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https://bugs.launchpad.net/bugs/1883438

Title:
  Gtk theme link_color is not beeing used

Status in update-manager package in Ubuntu:
  Confirmed

Bug description:
  In the "softwar updater" UI the color of links is not taken from the Gtk theme. 
  Yaru and Adwaita themes both "export" a "@theme_link_color" at the top of their gtk theme.
  The software manager UI should also use this link color. Especially in the yaru-dark theme the blue that is actually used has a very bad contrast against the background.

  Please look at the screenshot where I have compared the software
  updater to the about dialogue in files (which uses the correct
  $link_color, which can be selected as "@theme_link_color" in gtk
  apps).

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: update-manager 1:20.04.10
  ProcVersionSignature: Ubuntu 5.4.0-37.41-generic 5.4.41
  Uname: Linux 5.4.0-37-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.2
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Jun 14 18:00:10 2020
  InstallationDate: Installed on 2020-03-15 (91 days ago)
  InstallationMedia: Ubuntu 18.04.4 LTS "Bionic Beaver" - Release amd64 (20200203.1)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  SourcePackage: update-manager
  UpgradeStatus: Upgraded to focal on 2020-04-23 (52 days ago)

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