New answers tagged luks
The error code 4 returned by udisks2 (which is used by gnome-disks-utilities internally) is the constant UDISKS_ERROR_NOT_AUTHORIZED_CAN_OBTAIN in code. This code is returned, if the current subject (the gnome-disks applications, actually) is not allowed to do the unlock operation, however it might be allowed if further authentication would be provided, ...
Try with this solution. Is not per user. http://ubuntuforums.org/showthread.php?t=2198120
Answering my own question: There must be a corresponding entry in /etc/fstab in order for this to work properly. The timeout=10 option in 12.04 LTS appears to b unsupported
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