Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: emacs25 (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1710897
Title:
"Connection lost to X server", so this sounds like the following entry
from Emacs's etc/PROBLEMS:
** When Emacs is compiled with Gtk+, closing a display kills Emacs.
There is a long-standing bug in GTK that prevents it from recovering
from disconnects: