Flagging>Closing>Off-Topic>Migration has these choices:

belongs on meta.superuser.com discussion, support, and feature requests for this site

belongs on stackoverflow.com Q&A for professional and enthusiast programmers

belongs on serverfault.com Q&A for professional system and network administrators

belongs on webapps.stackexchange.com Q&A for power users of web applications

belongs on android.stackexchange.com Q&A for enthusiasts and power users of the Android operating system

14/48 of the 'Top Questions' list here when I posted this question were UNIX/Linux/Ubuntu related.

If there are more than five slots available, suggest adding

belongs on http://unix.stackexchange.com/ Q&A for users and administrators of UNIX and Linux operating systems

belongs on https://askubuntu.com/ Q&A for users and administrators of Ubuntu operating systems

I know there are many other Stack Exchange sites but those two generate a not insignificant number of questions here and if there are slots available, those communities could better serve those users IMHO, YMMV.