Inhibit logins and back up the /root and /home trees.

Upgrading Your linux Distribution mini-HOWTO
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10. Inhibit logins and back up the /root and /home trees.

This is the last thing to be done on the old system before you destroy it, so as to carry forward the most current user and root information. To inhibit logins, just echo "getting ready for upgrade" >/etc/nologin (as root, of course).

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Format floppies for the temporary kernel and the final build.		Boot from the new installation's boot and root floppies.