如何在 WSL2（Ubuntu 23.10）中为 Epiphany 浏览器（flatpak）设置暗模式？

Question

我在 Windows 11 WSL2 中运行 Ubuntu（预览版），即 Ubuntu 23.10。我安装了 Flatpak，然后从那里安装了 Gnome Web 浏览器，又名 Epiphany。我不知道如何将浏览器主题设置为暗黑模式。

在 Epiphany 设置中，在“外观”下，有“浅色”和“深色”主题选项，但选择深色没有任何作用，即使重新启动浏览器（甚至重新启动整个 Ubuntu VM）也是如此。浏览器窗口仍然是白色的。

我尝试过以下解决方案：

1. 从https://code.adonline.id.au/dark-theme-in-wsl2/..。

sudo apt install gnome-tweaks
gsettings set org.gnome.shell.ubuntu color-scheme prefer-dark
gsettings set org.gnome.desktop.interface gtk-theme Yaru-dark
gsettings set org.gnome.desktop.interface color-scheme prefer-dark
gsettings reset org.gnome.shell.ubuntu color-scheme

2. 从https://askubuntu.com/a/1408728/1020711..。

gsettings set org.gnome.desktop.interface gtk-theme Adwaita-dark
gsettings set org.gnome.desktop.interface color-scheme prefer-dark

3. 从https://askubuntu.com/a/1216263/1020711..。

flatpak install org.gtk.Gtk3theme.Yaru

4. 从https://www.reddit.com/r/bashonubuntuonwindows/comments/nmsmm9/comment/gzrv2gi/?context=3..。

添加GTK_THEME=Adwaita:dark到/etc/environment文件

5. 从https://github.com/microsoft/wslg/issues/251..。

sudo apt install dbus-x11

6. 从https://askubuntu.com/a/882515/1020711..。

将以下内容添加到“~/.config/gtk-3.0/settings.ini and~/.config/gtk-4.0/settings.ini”文件中：

[Settings]
gtk-application-prefer-dark-theme=1

这是 WSL2 的一个限制，导致颜色主题被破坏了吗？（注意：我正在使用 WSL2 的内置 GUI 渲染器，我相信它被称为 WSLg。我更希望针对这种情况找到解决方案，而不是使用其他 x-server 的解决方法。）

PS 如果相关的话，这是我从终端启动 Epiphany 时的 bash 输出：

Note that the directories

'/var/lib/flatpak/exports/share'
'/root/.local/share/flatpak/exports/share'

are not in the search path set by the XDG_DATA_DIRS environment variable, so
applications installed by Flatpak may not appear on your desktop until the
session is restarted.


(epiphany:2): Gdk-WARNING **: 00:41:41.376: Failed to read portal settings: GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface “org.freedesktop.portal.Settings” on object at path /org/freedesktop/portal/desktop
MESA: error: ZINK: failed to choose pdev
libEGL warning: egl: failed to create dri2 screen

(epiphany:2): epiphany-WARNING **: 00:41:41.589: Failed to search secrets in password schema: org.freedesktop.DBus.Error.ServiceUnknown

(process:2): Gdk-WARNING **: 00:41:41.671: Failed to read portal settings: GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface “org.freedesktop.portal.Settings” on object at path /org/freedesktop/portal/desktop
libEGL warning: MESA-LOADER: failed to open vgem: /usr/lib/x86_64-linux-gnu/GL/default/lib/dri/vgem_dri.so: cannot open shared object file: No such file or directory (search paths /usr/lib/x86_64-linux-gnu/GL/default/lib/dri, suffix _dri)

libEGL warning: MESA-LOADER: failed to open vgem: /usr/lib/x86_64-linux-gnu/GL/default/lib/dri/vgem_dri.so: cannot open shared object file: No such file or directory (search paths /usr/lib/x86_64-linux-gnu/GL/default/lib/dri, suffix _dri)

Unable to access the GBM device, disabling DMABuf video sink.