I was wondering how trusty's plymouth handles the kernel command line,
as the "splash" option isn't evaluated in the upstart jobs. It seems
this is done in src/main.c, plymouth_should_show_default_splash():

 if (command_line_has_argument (state->kernel_command_line, "splash"))
    {
      ply_trace ("using default splash because kernel command line has option 
\"splash\"");
      return true;
    }
[...]
  ply_trace ("no default splash because kernel command line lacks \"splash\" or 
\"rhgb\"");
  return false;

This seems to decide between the default (graphical) splash or the text
mode  where it shows detailed messages. AFAICS, ubuntu-gnome-default-
settings does not fundamentally change this.

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https://bugs.launchpad.net/bugs/1572874

Title:
  plymouth is disabled after upgrade from trusty due to missing "splash"
  kernel arg

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