Comment 4 for bug 882679

add the following line in the file /etc/apt/sources.list
>>>>>deb http://ftp.de.debian.org/debian sid main
then run the command "sudo apt-get install swift",
the latest version swift will be installed.
Refer to http://muhammadhamed.blogspot.com/2011/12/fix-swift-container-sync-does-not-exist.html