thanks for all these references! After posting my last reply, I booted the live Trisquel image, and mounted my /home partition. When I changed to my home folder, I was never prompted for passphrases, and I could read all the files. This suggests a bug in ubiquity, with the effect that, choosing the manual partition negates the action of checking the "encrypt my home folder" setting. It looks like I'll have to create another root user, and do this encryption manually; I found this reference for the procedure.
http://ubuntuguide.net/how-to-encrypt-home-folder-in-ubuntu-12-04

thanks, all,

Dave

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