无法上图，总是上传失败。
[lisir@lisir-PC ~]$ systemsettings5
Icon theme "Numix-Circle" not found.
Cyclic dependency detected between "file:///usr/lib/qt/qml/org/kde/kirigami.2/styles/org.kde.desktop.plasma/Units.qml" and "file:///usr/lib/qt/qml/org/kde/kirigami.2/styles/org.kde.desktop.plasma/Units.qml"
Icon theme "Numix-Circle" not found.
file:///usr/share/kpackage/genericqml/org.kde.systemsettings.sidebar/contents/ui/SubCategoryPage.qml:142:9: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<argu
ments>) { ... }
file:///usr/share/kpackage/genericqml/org.kde.systemsettings.sidebar/contents/ui/SubCategoryPage.qml:132:9: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<argu
ments>) { ... }
file:///usr/lib/qt/qml/org/kde/kirigami.2/private/RefreshableScrollView.qml:137:13: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
file:///usr/lib/qt/qml/org/kde/kirigami.2/private/RefreshableScrollView.qml:137:13: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
Cyclic dependency detected between "file:///usr/lib/qt/qml/org/kde/kirigami.2/styles/org.kde.desktop.plasma/Units.qml" and "file:///usr/lib/qt/qml/org/kde/kirigami.2/styles/org.kde.desktop.plasma/Units.qml"
QQmlEngine::setContextForObject(): Object already has a QQmlContext
qt.qpa.xcb: QXcbConnection: XCB error: 5 (BadAtom), sequence: 544, resource id: 0, major code: 20 (GetProperty), minor code: 0
[1]+ 段错误 （核心已转储）nohup systemsettings5 > /dev/null 2>&1
段错误 (核心已转储)
[lisir@lisir-PC ~]$

再以“Cyclic dependency detected between "file:///usr/lib/qt/qml/org/kde/kirigami.2/styles/org.kde.desktop.plasma/Units.qml" and "file:///usr/lib/qt/qml/org/kde/kirigami.2/styles/org.kde.desktop
.plasma/Units.qml"”为关键词搜索，
在www.删掉reddit删掉.com/r/ManjaroLinux/comments/hl9oox/i_broke_kde5_settings_with_a_theme/上找到了答案：
既可以新建个用户并将其~/.config目录拷贝覆盖掉。也可以在终端运行systemsettings5 --style=Breeze，这时可以打开系统设置，再赶紧将全局主题改掉，看能不能进入。

这个style的systemsetting5的参数在使用--help-all时是看不到的，所以即使在解决过程中想过恢复默认主题，可一没找到主题名字，二没找到这个参数。幸好最终找到了解决办法。狗歌大法好。