Comment 16 for bug 786402

I can confirm this issue on Ubuntu 18.04

$ cat /etc/issue
Ubuntu 18.04.1 LTS \n \l

$ ghemical

OpenGL extension version - 1.4
DEBUG ; preparing to open file /usr/share/libghemical/3.0.0/builder/amino.txt
DEBUG ; preparing to open file /usr/share/libghemical/3.0.0/builder/nucleic.txt
DEBUG ; preparing to open file /usr/share/libghemical/3.0.0/param_mm/default/atomtypes.txt
DEBUG ; preparing to open file /usr/share/libghemical/3.0.0/param_mm/default/parameters1.txt
DEBUG ; preparing to open file /usr/share/libghemical/3.0.0/param_mm/default/parameters2.txt
DEBUG ; preparing to open file /usr/share/libghemical/3.0.0/param_mm/default/parameters3.txt
DEBUG ; preparing to open file /usr/share/libghemical/3.0.0/param_mm/default/parameters4.txt
DEBUG ; preparing to open file /usr/share/libghemical/3.0.0/param_mm/tripos52/atomtypes.txt
DEBUG ; preparing to open file /usr/share/libghemical/3.0.0/param_mm/tripos52/parameters1.txt
DEBUG ; preparing to open file /usr/share/libghemical/3.0.0/param_mm/tripos52/parameters2.txt
DEBUG ; preparing to open file /usr/share/libghemical/3.0.0/param_mm/tripos52/parameters3.txt
DEBUG ; preparing to open file /usr/share/libghemical/3.0.0/param_mm/tripos52/parameters4.txt
DEBUG ; preparing to open file /usr/share/libghemical/3.0.0/param_mm/tripos52/parameters5.txt

(ghemical:27111): Gtk-WARNING **: 20:08:50.782: Unable to locate theme engine in module_path: "adwaita",

(ghemical:27111): Gtk-WARNING **: 20:08:50.785: Unable to locate theme engine in module_path: "adwaita",
Added local light.

OpenGL visual configurations :

gdk_gl_config_is_rgba (glconfig) = TRUE
gdk_gl_config_is_double_buffered (glconfig) = TRUE
gdk_gl_config_is_stereo (glconfig) = FALSE
gdk_gl_config_has_alpha (glconfig) = FALSE
gdk_gl_config_has_depth_buffer (glconfig) = TRUE
gdk_gl_config_has_stencil_buffer (glconfig) = TRUE
gdk_gl_config_has_accum_buffer (glconfig) = FALSE

(ghemical:27111): GdkGLExt-WARNING **: 20:08:50.855: cannot load PangoFont
*** ERROR : Can't load font 'courier 12'