Hide the common top menu in Ubuntu 12.04

隐藏：
1、sudo apt-get autoremove appmenu-gtk appmenu-gtk3 appmenu-qt
2、reboot

恢复：

1、sudo apt-get install appmenu-gtk appmenu-gtk3 appmenu-qt
2、reboot

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原文地址：https://www.cnblogs.com/wiessharling/p/3569616.html