启动某些应用程序时有关图标主题的无效上下文警告

Question

当我从终端启动 okular 时，我收到一堆关于某些图标主题文件夹的“无效上下文”警告（均来自 Yaru，这是 Gnome Tweaks 和 Adwaita 中设置的主题）。编辑要排除的命名目录的index.theme会删除警告，但会破坏一些UI（顶部栏设置中的小箭头变成交叉圆圈禁止图标），我想这是可以预料的。

谷歌搜索显示，这种情况发生在很多人的各种应用程序上，但我发现的解决方案不适用（特定于应用程序或 Arch）。

奥库拉似乎工作得很好。我最近从 19.10 升级到 20.4，但在此之前也存在该错误。

有谁知道我为什么收到这些警告或如何解决它们？

完整的命令行输出：

Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Yaru/16x16/legacy/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Yaru/22x22/legacy/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Yaru/24x24/legacy/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Yaru/32x32/legacy/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Yaru/48x48/legacy/"
Invalid Context= "Apps" line for icon theme:  "/usr/share/icons/Yaru/256x256@2x/apps/"
Invalid Context= "Mimetypes" line for icon theme:  "/usr/share/icons/Yaru/256x256@2x/mimetypes/"
Invalid Context= "Mimetypes" line for icon theme:  "/usr/share/icons/Yaru/scalable/mimetypes/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/8x8/legacy/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/16x16/legacy/"
Invalid Context= "UI" line for icon theme:  "/usr/share/icons/Adwaita/16x16/ui/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/22x22/legacy/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/24x24/legacy/"
Invalid Context= "UI" line for icon theme:  "/usr/share/icons/Adwaita/24x24/ui/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/32x32/legacy/"
Invalid Context= "UI" line for icon theme:  "/usr/share/icons/Adwaita/32x32/ui/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/48x48/legacy/"
Invalid Context= "UI" line for icon theme:  "/usr/share/icons/Adwaita/48x48/ui/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/64x64/legacy/"
Invalid Context= "UI" line for icon theme:  "/usr/share/icons/Adwaita/64x64/ui/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/96x96/legacy/"
Invalid Context= "UI" line for icon theme:  "/usr/share/icons/Adwaita/96x96/ui/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/256x256/legacy/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/512x512/legacy/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/scalable/legacy/"
Invalid Context= "UI" line for icon theme:  "/usr/share/icons/Adwaita/scalable/ui/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Yaru/16x16/legacy/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Yaru/22x22/legacy/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Yaru/24x24/legacy/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Yaru/32x32/legacy/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Yaru/48x48/legacy/"
Invalid Context= "Apps" line for icon theme:  "/usr/share/icons/Yaru/256x256@2x/apps/"
Invalid Context= "Mimetypes" line for icon theme:  "/usr/share/icons/Yaru/256x256@2x/mimetypes/"
Invalid Context= "Mimetypes" line for icon theme:  "/usr/share/icons/Yaru/scalable/mimetypes/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/8x8/legacy/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/16x16/legacy/"
Invalid Context= "UI" line for icon theme:  "/usr/share/icons/Adwaita/16x16/ui/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/22x22/legacy/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/24x24/legacy/"
Invalid Context= "UI" line for icon theme:  "/usr/share/icons/Adwaita/24x24/ui/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/32x32/legacy/"
Invalid Context= "UI" line for icon theme:  "/usr/share/icons/Adwaita/32x32/ui/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/48x48/legacy/"
Invalid Context= "UI" line for icon theme:  "/usr/share/icons/Adwaita/48x48/ui/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/64x64/legacy/"
Invalid Context= "UI" line for icon theme:  "/usr/share/icons/Adwaita/64x64/ui/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/96x96/legacy/"
Invalid Context= "UI" line for icon theme:  "/usr/share/icons/Adwaita/96x96/ui/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/256x256/legacy/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/512x512/legacy/"
Invalid Context= "Legacy" line for icon theme:  "/usr/share/icons/Adwaita/scalable/legacy/"
Invalid Context= "UI" line for icon theme:  "/usr/share/icons/Adwaita/scalable/ui/"

Answer 1

似乎（如此处和此处所述）某些图标主题（在您的情况下，Yaru 和 Adwaita）没有指定所有上下文。
我发现用 Okular 消除这些警告消息的最简单的解决方案是使用另一个图标主题，例如，在 Ubuntu 中使用oxygen-icon-theme 。
从终端安装氧气图标主题：

sudo apt update
sudo apt-get install oxygen-icon-theme

然后，转到“调整”并将“外观”菜单中的“图标”选项更改为“氧气”。