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grub

Ubuntu 13.04 Btrfs FileSystem: error: sparse file not allowed

I installed ubuntu 13.04 with Btrfs filesystem support, and when start system I met this error I’m running a btrfs on / with (fake)raid1 and grub2, solved by removing line: if [ -n ${have_grubenv} ]; then save_env recordfail; fi from /etc/grub.d/00_header file, and then running update-grub. find from here http://mirkolofio.wordpress.com/2011/05/20/error-sparse-file-not-allowed/