Sage 7.4 :  sage -i database_gap hangs    
   Using Sage 7.4 on Ubuntu 16.04, x86_64. The above command tries to load database_gap-4.8.3, but hangs after the messages:
[database_gap-4.8.3] Installed small group database.
[database_gap-4.8.3] Installed prim database.
[database_gap-4.8.3] Installed trans database.
[database_gap-4.8.3] Installed tomlib database.
