Comment 19 for bug 472681

https://help.ubuntu.com/community/Repositories/CommandLine

Just add this line to the bottom of the /etc/apt/sources.list file:
deb http://gb.archive.ubuntu.com/ubuntu/ karmic-proposed main multiverse universe

sudo nano /etc/apt/sources.list
scroll to the bottom and add this line.

save and exit

sudo apt-get update
sudo apt-get install samba libsmbclient

then you probably want to remove that line again afterwards as some of the updates have the possibility to break your system in that repo.