我想按照https://www.torproject.org/docs/debian.html.en#development在我的 ubuntu 14.04 上安装Tor 的 开发版本，但每当我运行命令时
sudo apt-get update
出现一些错误：
Err http://deb.torproject.org jessie/main Sources
404 Not Found [IP: 10.10.34.36 80]
Err http://deb.torproject.org jessie/main amd64 Packages
404 Not Found [IP: 10.10.34.36 80]
Err http://deb.torproject.org jessie/main i386 Packages
404 Not Found [IP: 10.10.34.36 80]
Ign http://deb.torproject.org jessie/main Translation-en_US
Ign http://deb.torproject.org jessie/main Translation-en
Fetched 435 kB in 5s (77.3 kB/s)
W: Failed to fetch bzip2:/var/lib/apt/lists/partial/ir.archive.ubuntu.com_ubuntu_dists_trusty-updates_main_i18n_Translation-en Hash Sum mismatch
W: Failed to fetch bzip2:/var/lib/apt/lists/partial/ir.archive.ubuntu.com_ubuntu_dists_trusty-backports_main_i18n_Translation-en Hash Sum mismatch
W: Failed to fetch bzip2:/var/lib/apt/lists/partial/ir.archive.ubuntu.com_ubuntu_dists_trusty-backports_universe_i18n_Translation-en …