If it helps, even Microsoft Windows 7 has issue with needing admin access (take ownership) to delete, rename etc. a file even though you have it.... sort of. I currently have this issue on Windows 10 using Oracle virtualbox.
The fix for Windows 7 is too convoluted to explain.
I remember getting someone’s script to resolve it.
Here is an explanation and the script (in case you switch to Windows : )
http://www.howtogeek.com/howto/windows-vista/add-take-ownership-to-explorer-right-click-menu-in-vista/
How come hackers have no issues! : )