I don't understand. Why are you expecting a crypttab to be created on package install? You say you were installing into an existing lvm; you don't say that this was an encrypted one. So what are you expecting to find in /etc/crypttab at install time?
I don't understand. Why are you expecting a crypttab to be created on package install? You say you were installing into an existing lvm; you don't say that this was an encrypted one. So what are you expecting to find in /etc/crypttab at install time?