我对 Linux 还很陌生，以为更换主题不会有什么坏处。但我打算删除活动主题，现在它无法启动。它只显示屏幕键盘并要求我选择其他主题，但一切似乎都卡在那里，我什么也做不了。
尝试从实时 USB 驱动器进行启动修复，但结果如下：
(glade2script:10037): Gtk-WARNING **: 15:04:41.042: Theme parsing error: gtk.css:68:35: The style property GtkButton:child-displacement-x is deprecated and shouldn't be used anymore. It will be removed in a future version
(glade2script:10037): Gtk-WARNING **: 15:04:41.042: Theme parsing error: gtk.css:69:35: The style property GtkButton:child-displacement-y is deprecated and shouldn't be used anymore. It will be removed in a future version
(glade2script:10037): Gtk-WARNING **: 15:04:41.042: Theme parsing error: gtk.css:73:46: The style property GtkScrolledWindow:scrollbars-within-bevel is deprecated and shouldn't be used anymore. It will be removed in a future version
(glade2script:10037): GLib-GIO-CRITICAL **: 15:04:41.367: g_dbus_proxy_new: assertion 'G_IS_DBUS_CONNECTION (connection)' failed
(glade2script:10037): GLib-GIO-CRITICAL **: 15:04:41.368: g_dbus_proxy_new: assertion 'G_IS_DBUS_CONNECTION (connection)' failed
(glade2script:10037): GLib-GIO-CRITICAL **: 15:04:41.368: g_dbus_proxy_new: assertion 'G_IS_DBUS_CONNECTION (connection)' failed
(glade2script:10037): GLib-GIO-CRITICAL **: 15:04:41.368: g_dbus_proxy_new: assertion 'G_IS_DBUS_CONNECTION (connection)' failed
(glade2script:10037): GLib-GIO-CRITICAL **: 15:04:41.368: g_dbus_proxy_new: assertion 'G_IS_DBUS_CONNECTION (connection)' failed
有人能告诉我如何从实时 USB 闪存盘更改硬盘安装的主题吗？或者告诉我除了从头开始重新安装之外还有什么其他方法可以解决这个问题？Kubuntu 18.04