Just bumping here because this happens with fresh installation of Ubuntu 18.04.1 (Bionic Beaver).
I just need to pullout language-pack-gnome-en package with: sudo apt-get install language-pack-gnome-en after which the following locales are generated: Generating locales (this might take a while)... en_AG.UTF-8... done en_AU.UTF-8... done en_BW.UTF-8... done en_CA.UTF-8... done en_DK.UTF-8... done en_GB.UTF-8... done en_HK.UTF-8... done en_IE.UTF-8... done en_IL.UTF-8... done en_IN.UTF-8... done en_NG.UTF-8... done en_NZ.UTF-8... done en_PH.UTF-8... done en_SG.UTF-8... done en_ZA.UTF-8... done en_ZM.UTF-8... done en_ZW.UTF-8... done Generation complete. Setting up language-pack-gnome-en (1:18.04+20180712) ... NOW gramps_4.2.8 launches without complain. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1511917 Title: Gramps detected incomplete GTK installation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gramps/+bug/1511917/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs