Regarding the EFI variables (default boot entry & chime volume) I found
the following situation:

- the kernel from live / installation dvd / iso does really contain the
screwed up efi module configuration: there doesn't seem to be any way to
access the firmware from within the live system

- the installed kernel (by that same installation) does have efi support
built-in: thus the configuration file in "/boot" doesn't seem to match
the installed kernel 3.19.0-15-generic.

 Snooping around in the variables this way gives me the following image:

 - I can't find or see the variables "SystemAudioVolume" and
"SystemAudioVolumeDB" and thus I cannot change the volume of the
infamous startup chime with my current setup

- regarding the boot sequence I see MS and Apple entries with mid level
cryptographic information and some megabyte of data associated: probably
the signed boot loaders of the default boot sequence. I know that it is
possible to determine the default boot volume from within Mac OS X but I
have no idea how to do this here.

- I am not able to see the hardware keys for signing my own kernel and I
am not sure if this would allow unrestricted access to the firmware. Bot
grub-XXX-signed and linux-XXX-signed seem to be crippled packages where
Grub can't load any configuration file and Linux doesn't find initrd and
can't even reboot.

Right now my system faithfully boots off the external hard drive but it takes 
time:
- first a pleasant gray screen while the Mac Firmware searches for one of 
Apple's cats
- at some point the gray screen time outs and decides to take the only option 
available: the grub esp on the external drive
- Grubs are known not be too fast: first a black screen blinking cursur. Than a 
menu that sometimes appears only at the end of its time out. Then some message 
about a blind boot because it couldn't find right video mode. Than finally the 
penguin lurks out of this box. But LSB-Waits one and a half minute for an cable 
ethernet connection that just won't be there. Then suddenly: the login screen.

I do understand that the hardware vendor is free to prefer certain
operating system vendors and boot methods over others and I do
understand that the distinction between hardware and software is not
that clear when you buy a Mac. But some things just didn't show up in
the manual of my Mac ....

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https://bugs.launchpad.net/bugs/1464831

Title:
  Ubuntu should default to an EFI compatible install

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