Now ubuntu13.04 and lower versions of the software source are not available, the author through the 13.04 version, the 14.10 of the software source updated to 13.04 of the souces.list inside, found the perfect download. Some software sources on the Internet and some 163 of Sohu, as well as colleges and universities can not be used, now share to everyone.
#deb cdrom:[ubuntu 14.04 LTS _trusty tahr_-Release amd64 (20140417)]/trusty main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# Newer versions of the distribution.
Deb Http://cn.archive.ubuntu.com/ubuntu/trusty main restricted
DEB-SRC http://cn.archive.ubuntu.com/ubuntu/trusty Main restricted
# # Major bug fix updates produced after the final release of the
# # Distribution.
Deb Http://cn.archive.ubuntu.com/ubuntu/trusty-updates main restricted
DEB-SRC http://cn.archive.ubuntu.com/ubuntu/trusty-updates Main restricted
# # N.B. Software from this repository are entirely unsupported by the Ubuntu
# # Team. Also, please note this software in universe won't receive any
# # Review or updates from the Ubuntu security team.
Deb Http://cn.archive.ubuntu.com/ubuntu/trusty Universe
DEB-SRC Http://cn.archive.ubuntu.com/ubuntu/trusty Universe
Deb Http://cn.archive.ubuntu.com/ubuntu/trusty-updates Universe
DEB-SRC Http://cn.archive.ubuntu.com/ubuntu/trusty-updates Universe
# # N.B. Software from this repository are entirely unsupported by the Ubuntu
# # Team, and may not is under a free licence. Satisfy yourself as to
# # Your rights to use the software. Also, please note this software in
# # Multiverse won't receive any review or updates from the Ubuntu
# # Security Team.
Deb Http://cn.archive.ubuntu.com/ubuntu/trusty Multiverse
DEB-SRC Http://cn.archive.ubuntu.com/ubuntu/trusty Multiverse
Deb Http://cn.archive.ubuntu.com/ubuntu/trusty-updates Multiverse
DEB-SRC Http://cn.archive.ubuntu.com/ubuntu/trusty-updates Multiverse
# # N.B. Software from this repository and not having been tested as
# extensively as that contained in the main release, although it includes
# # Newer versions of some applications which may provide useful features.
# # Also, please note this software in Backports won't receive any review
# # or updates from the Ubuntu security team.
Deb Http://cn.archive.ubuntu.com/ubuntu/trusty-backports main restricted universe multiverse
DEB-SRC http://cn.archive.ubuntu.com/ubuntu/trusty-backports main restricted universe multiverse
Deb Http://security.ubuntu.com/ubuntu trusty-security main restricted
DEB-SRC Http://security.ubuntu.com/ubuntu trusty-security Main restricted
Deb Http://security.ubuntu.com/ubuntu trusty-security Universe
DEB-SRC Http://security.ubuntu.com/ubuntu trusty-security Universe
Deb Http://security.ubuntu.com/ubuntu trusty-security Multiverse
DEB-SRC Http://security.ubuntu.com/ubuntu trusty-security Multiverse
# # Uncomment the following, lines to add software from Canonical ' s
# # ' partner ' repository.
# # This software was not part of Ubuntu, but was offered by Canonical and the
# # respective vendors as a service to Ubuntu users.
# Deb Http://archive.canonical.com/ubuntu trusty partner
# DEB-SRC Http://archive.canonical.com/ubuntu Trusty Partner
# # This software was not part of Ubuntu, but was offered by Third-party
# # developers want to ship their latest software.
Deb Http://extras.ubuntu.com/ubuntu Trusty Main
DEB-SRC Http://extras.ubuntu.com/ubuntu Trusty Main
Ubuntu Software Park that can be used