How can I transfer files between two Ubuntu computers on a LAN without installing additional software?

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http://askubuntu.com – I know I can install Samba or openssh-server to be able to share files between two Ubuntu computers. Is there a way to share files without installing additional packages? I installed Ubuntu on two systems on the same LAN, but without Internet connectivity. I found that my usual way of transferring files (scp) failed because openssh-server was not installed on either system. Using Personal File Sharing was impossible without installing extra packages. I ended up using netcat to transfer, which is suboptimal and not intuitive for the average user. So I'd like to know if anyone knows of a way t (HowTos)