I've managed to put my laptop in a state of no-boot while trying to perform update and I suspect I know exactly what is wrong. In order to correct the problem, I need access to at least /boot and preferably my home directory on my HDD. I've booted from an Ubuntu 16.04 image on a bootable USB thumb drive and I've managed to mount and decrypt my hard disk. The issue now is that I can see the folder structure on my hard disk, but most of folders appear to be empty and it seems as though I may simply not have permissions over any of the files.
In the case of my home directory, it's understandable (I'd need to impersonate myself? sudo is not working because my user account does not exist in this image), but I'm not sure why I can't see any files in /boot. I know the relevant passwords. How can I convince my HDD that I'm me?
Any direction would be much appreciated.
EDIT: I've managed to grant myself permissions over the contents of my home directory using chmod so worst case scenario, I should be able to do an extraction... but why does /boot still appear to be empty, even after modifying permissions?
Incidentally I had backed up the files I botched in my home directory before it all went horribly wrong; I've tried copying them into /boot, but Ubuntu doesn't seem to see them at boot. Why didn't this work?