无法启动Ubuntu 18.04.4 gnome-control-center：[GLib-GIO]未安装设置架构'org.pantheon.desktop.gala.animations'

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我最近将系统从16.04.5升级到18.04.4。

我无法启动“设置”。如果我从终端启动gnome-control-center，则会出现以下错误：

$ gnome-control-center 
[INFO 20:42:56.700074] Application.vala:153: System Settings version: 2.0
[INFO 20:42:56.700118] Application.vala:155: Kernel version: 4.15.0-99-generic
[ERROR 20:42:56.771530] [GLib-GIO] Settings schema 'org.pantheon.desktop.gala.animations' is not installed
/usr/bin/gnome-control-center: line 20:  6840 Trace/breakpoint trap   (core dumped) switchboard $switchboard_options $requested_plug

能否请你帮忙？谢谢！