Some additional detail, in case it might be useful: I can launch gnome-terminal using dbus-launch, but not directly. I can launch other terminals (Xfce Terminal) without a problem. I include some details about my system, including locale info, since some people seem to think that is implicated in some of these problems.
$ gnome-terminal # Error constructing proxy for org.gnome.Terminal:/org/gnome/Terminal/Factory0: Error calling StartServiceByName for org.gnome.Terminal: Timeout was reached $ dbus-launch gnome-terminal (succeeds) $ uname -a Linux paulus 4.15.0-32-generic #35-Ubuntu SMP Fri Aug 10 17:58:07 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux $ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 18.04.1 LTS Release: 18.04 Codename: bionic $ localectl System Locale: LANG=en_US.UTF-8 VC Keymap: n/a X11 Layout: us X11 Model: pc105 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1772259 Title: gnome-terminal won't start To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-terminal/+bug/1772259/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs