/var/lib/ureadahead/debugfs is just mounted off somewhere on your /
filesystem. It has nothing to do with the difference in reported sizes.
The difference is due to a confusion between various tools as to what
"GB" means. The installer matches what hard disk manufacturers
generally use, so 320 GB = 320 * 1000 * 1000 * 1000 bytes. GParted is
apparently reporting in binary units (sometimes spelled "GiB"), and
298.1 GiB = 298.1 * 1024 * 1024 * 1024 bytes, which if you do the sums
comes out to about 320.08 GB. So you haven't lost any disk space -
you're just seeing different numbers reported by different programs.
Ubuntu has recently adopted a policy stating that: (a) GB must always
mean decimal units and GiB must always mean binary units; (b) hard disk
sizes are to be reported in decimal units; (c) some other things that
aren't relevant here. This policy is controversial for various reasons
and we may amend it, but I don't think too many people seriously
disagree with the notion that hard disk sizes should be reported in
units that match what the label on the disk you bought says, or at least
that you should be able to see them in those units.
The installer is abiding by this policy, as in fact it has done since
Ubuntu started; but GParted looks as though it ought to be changed to
use decimal units rather than binary units.
** Package changed: ubiquity (Ubuntu) => gparted (Ubuntu)
** Also affects: ubiquity (Ubuntu)
Importance: Undecided
Status: New
--
can not use 20 gb of internal hdd (/var/lib/ureadahead/debugfs)
https://bugs.launchpad.net/bugs/539653
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