Not sure how official this is yet as there is not much sign in the mailing list
And a crash immediately 
Lots of (kicad:15916): Gtk-CRITICAL **: IA__gtk_widget_set_size_request: assertion ‘width >= -1’ failed
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I took the source from the ppa last night and built a .deb package, it installed and ran great on Debian 9 stable. No issues here.
The Ubuntu guy always seems to jump the gun 
Wayne set the release date for 4.0.7 at July 30, might have changed.
Would be worth looking through change log for 4.0.7, usually it is a few bug fixes and not major changes.
https://git.launchpad.net/kicad/log/?h=4.0 perhaps more changes than usual, I don’t see anything obviously related.
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Necro thread, I know, I know, I know…
Tonight the forum made it my first unread linky!
Found this quite amusing!
As I’m a Windoze user… LOL!