参考：
https://stackoverflow.com/questions/22983101/how-to-uninstall-intellij-idea-on-ubuntu-13-10
https://askubuntu.com/questions/300684/uninstall-intellij-ultimate-edition-version-12
@lena
安装的时候是用的解压Idea压缩包之后的bin/idea.sh安装的
然后想卸载，直接删除解压之后的idea程序目录是不够的，还必须把/home/目录下的.IdeaIC2017.2/这个隐藏目录给删掉才算彻底卸载，否则无法重装
To remove the product completely, do the following:
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Delete the installation directory
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Delete the "config" and "system" configuration directories. These contain IntelliJ IDEA's caches, configuration and plugins.
See http://devnet.jetbrains.net/docs/DOC-181 for the OS specific locations of these two directories.
That should be all you need.