选择“扩展”然后开启“dash to dock”，如下图所示：  查看/var/log/message日志，报错内容如下： ``` Aug 11 17:36:23 localhost org.gnome.Shell.desktop: extracting: /root/.local/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/metadata.json Aug 11 17:36:23 localhost journal: Some code accessed the property 'ENABLED_EXTENSIONS_KEY' on the module 'extensionSystem'. That property was defined with 'let' or 'const' inside the module. This was previously supported, but is not correct according to the ES6 standard. Any symbols to be exported from a module must be defined with 'var'. The property access will work as previously for the time being, but please fix your code anyway. Aug 11 17:36:23 localhost journal: Extension "dash-to-dock@micxgx.gmail.com" had error: TypeError: Main.overview.viewSelector is undefined Aug 11 17:36:23 localhost journal: dash-to-dock_micxgx.gmail.com has error: TypeError: Main.overview.viewSelector is undefined ``` 原因： ~~~ This is actually because of new "more classic" classic session. ~~~ 解决： ~~~ vi /usr/share/gnome-shell/modes/classic.json 修改"hasOverview": false为"hasOverview": true ALT+F2，输入r重启gnome ~~~