Link para Ubuntu 10.04 final

http://releases.ubuntu.com/releases/10.04/ubuntu-10.04-desktop-i386.iso

http://releases.ubuntu.com/releases/10.04/ubuntu-10.04-desktop-amd64.iso

http://releases.ubuntu.com/releases/10.04/ubuntu-10.04-server-i386.iso

http://releases.ubuntu.com/releases/10.04/ubuntu-10.04-server-amd64.iso

http://releases.ubuntu.com/releases/10.04/ubuntu-10.04-alternate-i386.iso

http://releases.ubuntu.com/releases/10.04/ubuntu-10.04-alternate-amd64.iso

http://releases.ubuntu.com/releases/10.04/ubuntu-10.04-netbook-i386.iso

http://releases.ubuntu.com/releases/10.04/ubuntu-10.04-netbook-armel+dove.img

http://releases.ubuntu.com/releases/10.04/ubuntu-10.04-netbook-armel+imx51.img

Você pode baixar usando:

wget -c "uma das opções acima" sem as aspas. Desta maneira nunca tive problemas com arquivos corrompidos, mesmo a net caindo algumas vezes.