From
https://help.ubuntu.com/community/btrfs
............... You must install it to either the parent (sda rather than sda1; 
MBR/Reserved Sectors) 'OR' use a dedicated /boot partition as described in the 
forum post below. 
When installing Ubuntu in one large btrfs-Partition without an extra 
boot-partition, take care to keep about 1 Mib space free at the beginning of 
the disk. When there is not this space, the installer fails at the end when 
trying to install Grub! ............

And 
https://btrfs.wiki.kernel.org/index.php/Ubuntu_support
......long and involve good understanding of btrf. and how to........
That is not an easy normal installation of ext4... I just learn that today 
after reading many more info on how to btrf?

Can someone confirm the above issue.

That I am too naive to just select the btrf in replacement of ext4,
during the normal installation.

Because if we want to use btrf we need to follow these instructions in 
https://btrfs.wiki.kernel.org/index.php/Ubuntu_support

or it is another bug in the 12.04.1 installation programs?

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https://bugs.launchpad.net/bugs/1030772

Title:
  btrf file system was selected as root partitions (Live USB). produce
  the same bug report as Live DVD installation

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