ubnutu的任务栏都是在左侧:
zhang@zhang-virtual-machine:~$ gsettings set com.canonical.Unity.Launcher launcher-position Bottom #底部(苹果风格)
zhang@zhang-virtual-machine:~$ gsettings set com.canonical.Unity.Launcher launcher-position Left #左侧(默认)
zhang@zhang-virtual-machine:~$ gsettings set com.canonical.Unity.Launcher launcher-position Right #右侧
zhang@zhang-virtual-machine:~$ gsettings set com.canonical.Unity.Launcher launcher-position Top #顶部