I exited GParted and tried this command, but got:
(to clarify, the alternative command also failed with the same message). Is the partition corrupt at "source"?
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$ sudo e2fsck -f -y -v /dev/sdb3 e2fsck 1.41.14 (22-Dec-2010) e2fsck: Superblock invalid, trying backup blocks... e2fsck: Bad magic number in super-block while trying to open /dev/sdb3 The superblock could not be read or does not describe a correct ext2 filesystem. If the device is valid and it really contains an ext2 filesystem (and not swap or ufs or something else), then the superblock is corrupt, and you might try running e2fsck with an alternate superblock: e2fsck -b 8193 <device>