On Saturday, November 26, 2016 9:51:01 PM CST Carlos E. R. wrote:
There is a trick for that.
In the first encrypted partition, create a random file, and add it as a key to the second one. Then configure /etc/cryptotab to use that file to open the second partition, instead of prompting for the password (that it is still valid).
The sequence then would be that the system prompts for the password to the first partition, which is then opened. Then the system uses the key file to open the second partition, automatically.
I have notes on the exact procedure somewhere, but the above might be enough of a hint to guide you. If not, I'll search for my notes.
I will search around for a guide with your hints. Thanks for the quick response!