Upgrade an encrypted Ubuntu

Basil Chupin blchupin at iinet.net.au
Sat Mar 10 23:40:59 UTC 2012

On 11/03/12 03:17, Amichai Rotman wrote:
> Hello all,
> I have a netbook running Ubuntu Natty. I installed it using the 
> Alternative CD and chose to encrypt both the root and the home partitions.
> I plan to upgrade to the next release (12.04), but I am not sure how 
> to approach this so I do not get locked out of my data.
> I also thought I'd like to change the encryption method from a 
> passphrase to a key file. I got the idea watching a tutorial for using 
> an external USB device as a boot partition when installing Backtrack 5 
> on Revision3's Hak5.
> Can anyone point me to a step by step guide for doing this?
> Thanks!

I cannot offer help on this.

But I did want to say that you should be aware that there are 2 types of 
encryption: block encryption and file encryption and what you are using 
is block encryption. What this means is that if you copy/backup a file 
from, say, your encrypted /home to some other device (HDD or USB stick) 
that file is now just an "ordinary" file and can be read by anyone; 
UNLESS you copy that file to another directory which has been also 
encrypted on the destination device.


The vulgar crowd always is taken by appearances, and the world consists chiefly of the vulgar.
                    Niccolo Machiavelli

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