I'll try to keep it short.

I have a USB drive that I installed a persistent version of BT4 on using whole disk encryption a few years ago. (I followed the directions at infosecramblings.) I haven't used either that USB drive or BT in years. When I tried to boot from it today I got a GRUB error 17 which IIRC has something to do with partitions but it's been a long time since I used Linux.

Is there any way to recover my drive? I still recall my password. I don't care at this stage if I can get the drive to reboot again or just decrypt to get the data off it. I know that these forums are not the best place for Linux questions but my Google searching didn't turn up anything obvious, so even a pointer to another forum would be welcome.