That version is now dead
http://news.softpedia.com/news/ubuntu-17-04-zesty-zapus-has-reached-end-of-life-upgrade-to-ubuntu-17-10-now-519360.shtml
** Changed in: gnome-terminal (Ubuntu)
Status: New => Invalid
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Bugs, wh
Unfortunately Gtk+ has some bugs with drag-n-dropping. That's why
mainstream gnome-terminal has disabled dnd'ing tabs across windows for
the time being -- apparently Ubuntu has either reverted this change or
ships a slightly older version of gnome-terminal.
I cannot exactly reproduce what you desc