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    Make it 666. There's no point giving execution permission to that device. Commented Sep 23, 2012 at 7:56
  • OK, if you say so :) Commented Sep 23, 2012 at 12:50
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    I have similar problem (debug1: read_passphrase: can't open /dev/tty: No such device or address) but chmod 666 /dev/tty does not help. It works with my user, but after I switched to another user with su it fails. Commented Mar 28, 2013 at 20:31
  • @dma_k I had this problem as well. The fix was to run su with -s /bin/bash Commented Dec 24, 2017 at 18:54