Comment 11 for bug 1453738

I too just did a fresh install in the same manner and am noticing this effect.
I did a search because it was getting annoying: eg. "$ sudo service ufw restart" resulted in "Please enter passphrase for disk ubuntu--vg-swap_1 (cryptswap1) on none! ****************"

It just didn't seem right and I'm glad to find out it is simply a bug.