[Linux] Editor will lock/crash after exiting About Unity window on CentOS 7

Using the CentOS 7 version of the Unity editor, if the user views the "About Unity" dialog and closes it, Unity will lock until killed.

The following can be found at the end of the Editor.log which may be helpful:

Unhandled description string =
Unhandled description string -
Unhandled description string TAB
Unhandled description string TAB
Unhandled description string '
[0816/102235:ERROR:browser_main_loop.cc(207)] Gtk: gtk_widget_get_scale_factor: assertion 'GTK_IS_WIDGET (widget)' failed
[0816/102235:ERROR:browser_main_loop.cc(207)] Gtk: gtk_widget_get_scale_factor: assertion 'GTK_IS_WIDGET (widget)' failed
GLX Extensions: GLX_ARB_create_context GLX_ARB_create_context_profile GLX_ARB_create_context_robustness GLX_ARB_fbconfig_float GLX_ARB_framebuffer_sRGB GLX_ARB_get_proc_address GLX_ARB_multisample GLX_EXT_buffer_age GLX_EXT_create_context_es2_profile GLX_EXT_create_context_es_profile GLX_EXT_fbconfig_packed_float GLX_EXT_framebuffer_sRGB GLX_EXT_import_context GLX_EXT_texture_from_pixmap GLX_EXT_visual_info GLX_EXT_visual_rating GLX_INTEL_swap_event GLX_MESA_copy_sub_buffer GLX_MESA_multithread_makecurrent GLX_MESA_query_renderer GLX_MESA_swap_control GLX_OML_swap_method GLX_OML_sync_control GLX_SGIS_multisample GLX_SGIX_fbconfig GLX_SGIX_pbuffer GLX_SGIX_visual_select_group GLX_SGI_make_current_read GLX_SGI_swap_control GLX_SGI_video_sync
Adding genesis user token Adding genesis user token Adding genesis user token [Unity Package Manager (Upm)]
Parent process [1644] was terminated

Steps to reproduce:
- Create/open a new Unity project (2019.3.01a or later)
- Access the "About Unity" dialog (Help > About Unity)
- Close the dialog
- Observe the Unity editor has locked/crashed