Due to a problem with my ubuntu 13.10 (apparently it's incompatible with my graphics card as I explained here), I decided that I will install the LTS 12.04 version instead.. so I prepared a bootable USB now and ready to install.
But first, I want to backup my data from the old installation, I had files in the home directory that I would like to keep.
So when I booted from the USB stick, I chose "Try Ubuntu" to try to access my old files and back them up. So from nautilus I found the drive that contains my old installation, went through Home -> myusername but then I get the following message:
The folder contents could not be displayed - You do not have the permissions necessary to view the contents of myusername
Makes sense, because I had a password there, now how can I access this folder?
I tried launching Nautilus as sudo, now I can open myusername directory to find two files:
Access-Your-Private-Data.desktop, when I try to open the later I see an error message saying
Untrusted application launcher - The application launcher "Access-Your-Private-Data.desktop" has not been marked as trusted. If you do not know the source of this file, launching it may be unsafe.
I cannot find a way to get past this error message, I can only hit "Cancel"