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I was trying to resize my EXT4 partition and something went wrong. I lost it. The space in once consumed is now being represented as Unallocated. How do I recover the partition?

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up vote 4 down vote accepted

Well provided you haven't overwritten it, it's possible.

sudo apt-get install testdisk
sudo testdisk

Here's a full thread showing how somebody restored their EXT4 partition (including some complications):

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