[ubuntu] 搞壞了sudo...must be owned by uid 0 and have the setuid bit set

sudo: /usr/bin/sudo must be owned by uid 0 and have the setuid bit set

XD不小心下錯了chown的指令，然後sudo就爆了。
搞了一小時還是沒弄好機器，
還是重裝VM的存檔-,,-
有招一日再來研究研究

http://ithelp.ithome.com.tw/articles/10053821
https://my.oschina.net/cxz001/blog/297404
http://unix.stackexchange.com/questions/16962/how-to-get-back-sudo-on-ubuntu