Trying to fulfill your request led me to figure out what is happening, and why it is my dumb mistake, no creepy, crawly bug here.
What I meant about "no passphrase" actually is, you need to fill it the first time, then after that the passphrase is not asked for. This latter was what freaked me out. Trying to frame that phrase above in my initial stab at an answer to your email, I suddenly remembered that there were several options: turns out, I had chosen "remember passphrase til I log out" but really wanted "forget it immediately." (See attached screenshot.) Rebooting, plugging device in, choosing forget immediately leads to the desired behavior. There's a slight booby trap, from my perspective: the default option is "remember til log out," I'll need to look into changing that default. So, in summary, no bug, just poorly understood feature on my part. Sorry for wasting your time on this. ** Attachment added: "Passphrase dialog" https://bugs.launchpad.net/ubuntu/+source/cryptsetup/+bug/1399692/+attachment/4274856/+files/unlock.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1399692 Title: cryptsetup dialog does not ask for passphrase, just opens volume To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cryptsetup/+bug/1399692/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs