The upgrade is successfully started, but then got this error:
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/dapper/main/source/Sources 404 Not Found [IP: 91.189.92.181 80] ...
The Internet connection is fine. When I simply open that URL in browsed I still get 404.
/etc/apt/sources.list:
deb http://ua.archive.ubuntu.com/ubuntu/ oneiric main restricted deb-src http://ua.archive.ubuntu.com/ubuntu/ oneiric main restricted deb http://ua.archive.ubuntu.com/ubuntu/ oneiric-updates main restricted deb-src http://ua.archive.ubuntu.com/ubuntu/ oneiric-updates main restricted deb http://ua.archive.ubuntu.com/ubuntu/ oneiric universe deb-src http://ua.archive.ubuntu.com/ubuntu/ oneiric universe deb http://ua.archive.ubuntu.com/ubuntu/ oneiric-updates universe deb-src http://ua.archive.ubuntu.com/ubuntu/ oneiric-updates universe deb http://ua.archive.ubuntu.com/ubuntu/ oneiric multiverse deb-src http://ua.archive.ubuntu.com/ubuntu/ oneiric multiverse deb http://ua.archive.ubuntu.com/ubuntu/ oneiric-updates multiverse deb-src http://ua.archive.ubuntu.com/ubuntu/ oneiric-updates multiverse deb http://security.ubuntu.com/ubuntu oneiric-security main restricted deb-src http://security.ubuntu.com/ubuntu oneiric-security main restricted deb http://security.ubuntu.com/ubuntu oneiric-security universe deb-src http://security.ubuntu.com/ubuntu oneiric-security universe deb http://security.ubuntu.com/ubuntu oneiric-security multiverse deb-src http://security.ubuntu.com/ubuntu oneiric-security multiverse deb http://extras.ubuntu.com/ubuntu oneiric main deb-src http://extras.ubuntu.com/ubuntu oneiric main deb-src http://archive.canonical.com/ lucid partner deb-src http://archive.ubuntu.com/ubuntu dapper main multiverse deb-src http://archive.ubuntu.com/ubuntu dapper-updates main multiverse deb http://archive.canonical.com/ lucid partner deb-src http://archive.canonical.com/ lucid partner
How can I get through this?