折腾了几天,从Breezy升级到Dapper----失败
下载 ISO 映像文件刻成光盘---OK
sudo cp /etc/apt/sources.list /etc/apt/sources.list_backupsudo gedit /etc/apt/sources.list
## Add comments (##) in front of any line to remove it from being checked.## Use the following sources.list at your own risk.deb http://archive.ubuntu.com/ubuntu dapper main restricted universe multiversedeb-src http://archive.ubuntu.com/ubuntu dapper main restricted universe multiverse## MAJOR BUG FIX UPDATES produced after the final releasedeb http://archive.ubuntu.com/ubuntu dapper-updates main restricted universe multiversedeb-src http://archive.ubuntu.com/ubuntu dapper-updates main restricted universe multiverse## UBUNTU SECURITY UPDATESdeb http://security.ubuntu.com/ubuntu dapper-security main restricted universe multiversedeb-src http://security.ubuntu.com/ubuntu dapper-security main restricted universe multiverse## BACKPORTS REPOSITORY (Unsupported. May contain illegal packages. Use at own risk.)deb http://archive.ubuntu.com/ubuntu dapper-backports main restricted universe multiversedeb-src http://archive.ubuntu.com/ubuntu dapper-backports main restricted universe multiverse## PLF REPOSITORY (Unsupported. May contain illegal packages. Use at own risk.)deb http://packages.freecontrib.org/ubuntu/plf breezy free non-freedeb-src http://packages.freecontrib.org/ubuntu/plf breezy free non-free
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更新源
sudo apt-get update

