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导致原因 (gnome-shell:3120)：Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: 断言‘CLUTTER_IS_LAYOUT_MANAGER (manager)’失败

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导致原因 (gnome-shell:3120)：Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: 断言‘CLUTTER_IS_LAYOUT_MANAGER (manager)’失败 
chris@localhost:/var/log$ lsb_release -crid
Distributor ID: Ubuntu
Description:    Ubuntu 16.04.1 LTS
Release:    16.04
Codename:   xenial

chris@localhost:/var/log$ apt-cache policy gnome-shell
gnome-shell:
Installed: 3.20.4-0ubuntu2~ubuntu16.04.1
Candidate: 3.20.4-0ubuntu2~ubuntu16.04.1
Version table:
*** 3.20.4-0ubuntu2~ubuntu16.04.1 500
500 http://ppa.launchpad.net/gnome3-team/gnome3-staging/ubuntu xenial/main amd64 Packages


chris@localhost:/var/log$ apt-cache policy gdm3
Installed: 3.20.1-1ubuntu2~ubuntu16.04.1
Candidate: 3.20.1-1ubuntu2~ubuntu16.04.1
Version table:
*** 3.20.1-1ubuntu2~ubuntu16.04.1 500
500 http://ppa.launchpad.net/gnome3-team/gnome3-staging/ubuntu xenial/main amd64 Packages

被写入我的系统日志数千次的完整错误是

Dec 29 07:53:07 localhost org.gnome.Shell.desktop[3120]: (gnome-shell:3120): Clutter-CRITICAL **: clutter_layout_manager_get_child_meta:  assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
Dec 29 07:53:07 localhost org.gnome.Shell.desktop[3120]: (gnome-shell:3120): GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
Dec 29 07:53:07 localhost org.gnome.Shell.desktop[3120]: (gnome-shell:3120): GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
Dec 29 07:53:07 localhost org.gnome.Shell.desktop[3120]: (gnome-shell:3120): Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
Dec 29 07:53:07 localhost org.gnome.Shell.desktop[3120]: (gnome-shell:3120): GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
Dec 29 07:53:07 localhost org.gnome.Shell.desktop[3120]: (gnome-shell:3120): GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
Dec 29 07:53:07 localhost org.gnome.Shell.desktop[3120]: (gnome-shell:3120): Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed

因此，我的系统日志从昨天早上 7:35 到今天早上 7:35 的轮换结果为 - 238121171 Dec 29 07:35 syslog.1，事实上，由于某种原因，它太大了，没有被压缩。今天的系统日志到目前为止是 40027866 Dec 29 16:57 syslog，我想到明天早上它的大小将接近昨天的大小。

那么，问题是，是什么原因导致了这种情况，我该如何排除故障并修复它？

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