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bbfa235
(Get the code!)
@Martin Pitt:
Mounting as ext4 enables acl by default, but mounting as ext3 doesn't (see the linux kernel documentation).
My system was installed in November 2007, long before ext4 was stable (December 2008), so naturally '/' is formatted as ext3. I suppose other people have older filesystems too, or they chose not to use ext4 for some other reason.