Problème mise à niveau de Ubuntu pour 11.04

Bonjour, mon problème est que dés que je veux faire la mise à niveau de Ubuntu 10.10 (Maverick Meerkat) à Ubuntu 11.04 (Natty Narwhal) via le gestionnaire de téléchargement , celui ci ne me propose pas la mise à niveau comme il devrait le faire .
J'ai essayé de changer mon "sources.list" avec celui des autres, sans succès .
Voici mon "sources.list" : #############################################################
################### OFFICIAL UBUNTU REPOS ###################
#############################################################

###### Ubuntu Main Repos
deb http://fr.archive.ubuntu.com/ubuntu/ maverick main restricted universe multiverse
deb-src http://fr.archive.ubuntu.com/ubuntu/ maverick main restricted universe multiverse

###### Ubuntu Update Repos
deb http://fr.archive.ubuntu.com/ubuntu/ maverick-security main restricted universe multiverse
deb http://fr.archive.ubuntu.com/ubuntu/ maverick-updates main restricted universe multiverse
deb http://fr.archive.ubuntu.com/ubuntu/ maverick-proposed main restricted universe multiverse
deb http://fr.archive.ubuntu.com/ubuntu/ maverick-backports main restricted universe multiverse
deb-src http://fr.archive.ubuntu.com/ubuntu/ maverick-security main restricted universe multiverse
deb-src http://fr.archive.ubuntu.com/ubuntu/ maverick-updates main restricted universe multiverse
deb-src http://fr.archive.ubuntu.com/ubuntu/ maverick-proposed main restricted universe multiverse
deb-src http://fr.archive.ubuntu.com/ubuntu/ maverick-backports main restricted universe multiverse

###### Ubuntu Partner Repo
deb http://archive.canonical.com/ubuntu/ maverick partner
deb-src http://archive.canonical.com/ubuntu/ maverick partner

##############################################################
##################### UNOFFICIAL REPOS ######################
##############################################################

###### 3rd Party Binary Repos

#### Ailurus - https://code.google.com/archive/p/ailurus
## Run this command: sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 9A6FE242
deb http://ppa.launchpad.net/ailurus/ppa/ubuntu maverick main

#### AWN (Avant Window Navigator) Testing Packages - http://www.awn-project.org/
## Run this command: sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys BF810CD5
deb http://ppa.launchpad.net/awn-testing/ppa/ubuntu/ maverick main

#### Banshee - https://launchpad.net/~banshee-team
## Run this command: sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 6E80C6B7
deb http://ppa.launchpad.net/banshee-team/ppa/ubuntu/ maverick main

#### GetDeb - http://www.getdeb.net
## Run this command: wget -q -O- http://archive.getdeb.net/getdeb-archive.key | sudo apt-key add -
deb http://www.getdeb.net/wp-content/uploads/2018/10/ubuntu.png maverick-getdeb apps

#### Google Linux Software Repositories - http://www.google.com/linuxrepositories/index.html
## Run this command: wget -q https://dl-ssl.google.com/linux/linux_signing_key.pub -O- | sudo apt-key add -
deb http://dl.google.com/linux/deb/ stable non-free

#### Google Linux Software Repositories (Testing) - http://www.google.com/linuxrepositories/index.html
## Run this command: wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | sudo apt-key add -
deb http://dl.google.com/linux/deb/ testing non-free

#### VirtualBox - https://www.virtualbox.org/
## Run this command: wget -q http://download.virtualbox.org/virtualbox/debian/oracle_vbox.asc -O- | sudo apt-key add -
deb http://download.virtualbox.org/virtualbox/debian maverick contrib

#### VLC Media Player - http://www.videolan.org/vlc/
## Run this command: sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 40130828
deb http://ppa.launchpad.net/c-korn/ppa/ubuntu/ maverick main

#### Wine - https://launchpad.net/~ubuntu-wine/+archive/ubuntu/ppa
## Run this command: sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys F9CB8DB0
deb http://ppa.launchpad.net/ubuntu-wine/ppa/ubuntu/ maverick main


####### 3rd Party Source Repos

#### Ailurus (Source) - https://code.google.com/archive/p/ailurus
## Run this command: sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 9A6FE242
deb-src http://ppa.launchpad.net/ailurus/ppa/ubuntu maverick main

#### AWN (Avant Window Navigator) Testing Packages (Source) - http://www.awn-project.org/
## Run this command: sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys BF810CD5
deb-src http://ppa.launchpad.net/awn-testing/ppa/ubuntu/ maverick main

#### Banshee (Source) - https://launchpad.net/~banshee-team
## Run this command: sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 6E80C6B7
deb-src http://ppa.launchpad.net/banshee-team/ppa/ubuntu/ maverick main

#### VLC Media Player (Source) - http://www.videolan.org/vlc/
## Run this command: sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 40130828
deb-src http://ppa.launchpad.net/c-korn/ppa/ubuntu/ maverick main

#### Wine (Source) - https://launchpad.net/~ubuntu-wine/+archive/ubuntu/ppa
## Run this command: sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys F9CB8DB0
deb-src http://ppa.launchpad.net/ubuntu-wine/ppa/ubuntu/ maverick main