Sometimes I come across questions that are on-topic but cross-posted on multiple sites. According to Meta Stack Exchange, [cross-posting is highly discouraged](https://meta.stackexchange.com/a/64069/468333). 

[Unix and Linux](http://unix.stackexchange.com/) has a closing option for this, but Ask Ubuntu doesn't. 

[![close reason on U&L "posted n multiple sites"][1]][1]

Should this be implemented here on Ask Ubuntu or is it planned or not required at all (why?)?


  [1]: https://i.sstatic.net/xuTJd.png