Hello, I'm new with Ubuntu but not with Debian...

So, I have a special question regarding the backports.

Since I installed, I had some problems with the backports :

This is my /etc/apt/sources.list
Code:
#Les serveurs de l'Université de Sherbrooke
# Ubuntu CD-ROM (Hoary)
#deb cdrom:[Ubuntu 5.04 _Hoary Hedgehog_ - Release i386 (20050407)]/ hoary main restricted

# Marillat (Vidéo)
#deb ftp://ftp.nerim.net/debian-marillat/ testing main

# Ubuntu binaire (Hoary)
deb http://gulus.usherbrooke.ca/pub/distro/ubuntu/ hoary main restricted universe multiverse
deb http://gulus.usherbrooke.ca/pub/distro/ubuntu/ hoary-security main restricted universe multiverse
deb http://gulus.usherbrooke.ca/pub/distro/ubuntu/ hoary-updates main restricted universe multiverse

# Ubuntu sources (Hoary)
deb-src http://gulus.usherbrooke.ca/pub/distro/ubuntu/ hoary main restricted universe multiverse
deb-src http://gulus.usherbrooke.ca/pub/distro/ubuntu/ hoary-security main restricted universe multiverse
deb-src http://gulus.usherbrooke.ca/pub/distro/ubuntu/ hoary-updates main restricted universe multiverse

#Ubuntu Backports (Hoary) Official
deb http://ca.archive.ubuntu.com/ubuntu hoary-backports main universe multiverse restricted
#deb-src http://ca.archive.ubuntu.com/ubuntu hoary-backports main universe multiverse restricted

# Ubuntu Backports (Hoary) avant que ca change pour ca.archive.ubuntu.com
#deb http://ubuntu-backports.mirrormax.net/ hoary-backports main universe multiverse restricted
#deb http://ubuntu-backports.mirrormax.net/ hoary-extras main universe multiverse restricted
So since I wanted to install, Java,Azureus,Amule,Acroread....everythings was not found .
http://www.ubuntuguide.org/

So, what is official with that deposite :

#Ubuntu Backports (Hoary) Official
deb http://ca.archive.ubuntu.com/ubuntu hoary-backports main universe multiverse restricted

To make sure that I can install what I wanted, I changed my sources.list with that :

Code:
#Les serveurs de l'Université de Sherbrooke
# Ubuntu CD-ROM (Hoary)
#deb cdrom:[Ubuntu 5.04 _Hoary Hedgehog_ - Release i386 (20050407)]/ hoary main restricted

# Marillat (Vidéo)
#deb ftp://ftp.nerim.net/debian-marillat/ testing main

# Ubuntu binaire (Hoary)
deb http://gulus.usherbrooke.ca/pub/distro/ubuntu/ hoary main restricted universe multiverse
deb http://gulus.usherbrooke.ca/pub/distro/ubuntu/ hoary-security main restricted universe multiverse
deb http://gulus.usherbrooke.ca/pub/distro/ubuntu/ hoary-updates main restricted universe multiverse

# Ubuntu sources (Hoary)
deb-src http://gulus.usherbrooke.ca/pub/distro/ubuntu/ hoary main restricted universe multiverse
deb-src http://gulus.usherbrooke.ca/pub/distro/ubuntu/ hoary-security main restricted universe multiverse
deb-src http://gulus.usherbrooke.ca/pub/distro/ubuntu/ hoary-updates main restricted universe multiverse

#Ubuntu Backports (Hoary) Official
#deb http://ca.archive.ubuntu.com/ubuntu hoary-backports main universe multiverse restricted
#deb-src http://ca.archive.ubuntu.com/ubuntu hoary-backports main universe multiverse restricted

# Ubuntu Backports (Hoary) avant que ca change pour ca.archive.ubuntu.com
deb http://ubuntu-backports.mirrormax.net/ hoary-backports main universe multiverse restricted
deb http://ubuntu-backports.mirrormax.net/ hoary-extras main universe multiverse restricted
With mirrormax, I installed everythings...so is that because the soft are from hoary-extras....and if so, is there any official backports like deb http://ca.archive.ubuntu.com/ that I can use.

Thanks you in Advance.

Sorry for my bad English, but I understand 90% of that language....I read English, but my writting is very limited.