The package vsftpd is in the Main repo on Feisty and is listed in the "net"
section. If it is not in the US repos, then switch to the European repos;
just remove the "us" in the url in sources.list. For example:

deb http://us.archive.ubuntu.com/ubuntu/ feisty main restricted

becomes:

deb http://archive.ubuntu.com/ubuntu/ feisty main restricted

After you edit the sources, you will need run "update"

sudo apt-get update


Package info from:
http://us.archive.ubuntu.com/ubuntu/dists/feisty/main/binary-i386/

Package: vsftpd
Priority: extra
Section: net
Installed-Size: 408
Maintainer: Ubuntu Core Developers ubuntu-devel@...>
Original-Maintainer: Matej Vela vela@...>
Architecture: i386
Version: 2.0.5-2ubuntu2
Provides: ftp-server
Depends: libc6 (>= 2.5-0ubuntu1), libcap1, libpam0g (>= 0.76), libssl0.9.8
(>= 0.9.8c-1), libwrap0, libpam-modules, adduser, netbase, lsb-base (>=
1.3-9ubuntu3), ssl-cert (>= 1.0-11ubuntu1), sysv-rc (>=
2.86.ds1-14.1ubuntu2), update-inetd
Recommends: logrotate
Conflicts: ftp-server
Filename: pool/main/v/vsftpd/vsftpd_2.0.5-2ubuntu2_i386.deb
Size: 114386
MD5sum: 4f4c931fbf224f6e4c2d265671d14b56
SHA1: 8c50d39eca0816d4fa8275d0445c838e5dfdb566
SHA256: 442d08936178c2d99738fed767b3885a20ed5f894e5650de85868ff912de2891
Description: The Very Secure FTP Daemon
A lightweight, efficient FTP server written from the ground up with
security in mind.
.
vsftpd supports both anonymous and non-anonymous FTP, PAM authentication,
bandwidth limiting, and the Linux sendfile() facility.