[GRASS-user] opening dbf tables

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Dear all,
 
as i'm not very used used to work on vector files i don't know how to manage a (probably) simple problem.i'm working on some shapefiles to be imported in Grass, but before doing so i should modify the dbf table. When trying to open it (Ubuntu 12.04), i got the message 
 
(in italian) 
 
errore generale errore generale di I/O
 
i wasn't able to pen the table even by command line (sudo) nor found any hidden lock file in the directory. 
Any suggestion?Thanks a lot
Augusto 
 
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