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I've just used dd commands to clone my ubuntu11.04 to a larger partition.
However, my ext4fs hasn't detected the change. Thus, I've not been able to use the extra space yet.
So how to resize my file system to the size of the underlying partition?
There's nothing but my cloned file system on the larger partition.

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migrated from Aug 7 '11 at 2:21

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ok. solve it myself
plug in Live CD and launch GParted
right click on the partition mounted on root and choose resize/move
change free following space to 0 and use tab to jump to confirm
finally apply and everything is in order now

it seems guys here are not interested in ubuntu or just my question is too simple?

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