You can restore saved logs only if your Ubuntu installation as been upgraded from a previous version or if you (or the man who supported you) backed up your data in advance.
Reading your question I understand your helper put all your old data in a separate partition/position.
If so, first of all, ask him where he put your old data, and take a note: from now on I'll call this path
Then, note your user name: it is the name you can read in the top-right corner of your desktop in Ubuntu 11.04. I'll call this
<your-new-username> from now on.
Same for your old user-name before upgrading (in case it was different):
Now, open Nautilus, the file browser. If you don't know how to do, just open a terminal and type
Now you shall browse till you reach the path below. Starting from the
<OLD-PARTION> part, you only need to right click folders between "/" to reach it. If you cannot see the
.local folder, press
CTRL+H in Nautilus to show hidden files. Once you reach the "TpLogger" folder, right click on the "logs" folder and select
Then, do the same to restore, using following path. Once you reach the "TpLogger" folder, right click folder list and select
After this, restart Empathy.