Quoting Simone simone72@email.it:
I think this the problem is that the vg on my system has the same name of the one on the external usb disk, but I am not sure of what result would have running vgrename, vgcreate or lvcreate on the data, so I'd rather wait for some advice.
This would indeed be a problem. You might try disconnecting your internal drive, booting off rescue CD and renaming the volume group on external drive. Alternative to that would be to wipe out the external drive (if you don't have any data on it) and recreate it from scratch.
BTW, you can't mount partition that is marked as physical volume directly. You need to access logical volumes on it through LVM devices (usually /dev/vg-name/lv-name).
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