Twin directories of ubuntu-releases:

[DIR]  ftp://ftp.ru.kernel.org/ubuntu-releases/
[DIR]  ftp://ftp.nz.debian.org/ubuntu-releases/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/linux/ubuntu-releases/
[DIR]  ftp://ftp.wh8.tu-dresden.de/pub/linux/distributions/ubuntu-releases/
[DIR]  ftp://ftp.cs.mun.ca/pub/mirror/ubuntu-releases/
[DIR]  ftp://ftp13.freebsd.org/pub/ubuntu-releases/
[DIR]  ftp://130.239.18.163/mirror/ubuntu-releases/
[DIR]  ftp://ftp.net.usf.edu/pub/ubuntu-releases/
[DIR]  ftp://ftp.net.usf.edu/pub2/ubuntu-releases/
[DIR]  ftp://ftp.uwa.edu.au/mirrors/linux/ubuntu-releases/
[DIR]  ftp://64.50.238.52/.1/ubuntu-releases/
[DIR]  ftp://ftp.ntnu.no/ubuntu-releases/
[DIR]  ftp://64.50.236.52/.1/ubuntu-releases/
[DIR]  ftp://ftp.tiscali.nl/pub/mirror/ubuntu-releases/
[DIR]  ftp://77.88.19.68/ubuntu-releases/
[DIR]  ftp://ftp.cn.kernel.org/ubuntu-releases/
[DIR]  ftp://ftp2.sk.freebsd.org/ubuntu-releases/
[DIR]  ftp://ftp.tuke.sk/ubuntu-releases/
[DIR]  ftp://ftp.udc.es/mirror/ubuntu-releases/
[DIR]  ftp://ftp.mn-linux.org/linux/ubuntu-releases/
[DIR]  ftp://ftp.nfsi.pt/pub/ubuntu-releases/
[DIR]  ftp://83.166.201.99/ubuntu-releases/
[DIR]  ftp://130.239.18.173/mirror/ubuntu-releases/
[DIR]  ftp://77.88.19.73/ubuntu-releases/
[DIR]  ftp://bo.mirror.garr.it/pub/1/ubuntu-releases/
[DIR]  ftp://193.226.140.51/ubuntu-releases/
[DIR]  ftp://na.mirror.garr.it/pub/1/ubuntu-releases/
[DIR]  ftp://204.152.191.39/ubuntu-releases/
[DIR]  ftp://ftp.estpak.ee/pub/ubuntu-releases/
[DIR]  ftp://ftp.southcom.com.au/ubuntu-releases/
[DIR]  ftp://ftp.las.ic.unicamp.br/pub/ubuntu-releases/
[DIR]  ftp://ftp.vcu.edu/pub/gnu+linux/ubuntu-releases/
[DIR]  ftp://mirrors.kernel.org/ubuntu-releases/
[DIR]  ftp://ftp.man.szczecin.pl/pub/Linux/ubuntu-releases/
[DIR]  ftp://ftp.gnome.org/mirror/ubuntu-releases/
[DIR]  ftp://128.118.2.96/pub/.mirrors/1/ftp.ubuntu.com/ubuntu-releases/
[DIR]  ftp://ftp.tu-chemnitz.de/.SAN0/pub/linux/ubuntu-releases/
[DIR]  ftp://ftp.duth.gr/pub/ubuntu-releases/
[DIR]  ftp://ftp.cerias.purdue.edu/pub/os/ubuntu-releases/
[DIR]  ftp://ftp.filearena.net/mnt3/ubuntu-releases/
[DIR]  ftp://ftp.sk.freebsd.org/ubuntu-releases/
[DIR]  ftp://ftp.ussg.iu.edu/linux/ubuntu-releases/
[DIR]  ftp://204.152.191.7/ubuntu-releases/
[DIR]  ftp://199.6.1.174/ubuntu-releases/
[DIR]  ftp://130.239.17.6/ubuntu-releases/
[DIR]  ftp://ftp.csc.calpoly.edu/ubuntu-releases/
[DIR]  ftp://ftp.uvigo.es/mirror2/mirror/ubuntu-releases/
[DIR]  ftp://ftp2.ca.freebsd.org/ubuntu-releases/
[DIR]  ftp://ftp9.freebsd.org/pub/ubuntu-releases/
[DIR]  ftp://ftp.task.gda.pl/vol/zfs/ftp.ubuntu.com/ubuntu-releases/