当我运行时： apt-get update 我收到以下错误：
Err http://us.archive.ubuntu.com trusty/mainarmhf Packages 404 Not Found [IP: 91.189.91.13 80] Err http://us.archive.ubuntu.com trusty/universearmhf Packages 404 Not Found [IP: 91.189.91.13 80] Err http://us.archive.ubuntu.com trusty-updates/mainarmhf Packages 404 Not Found [IP: 91.189.91.901 Err http://us.archive.ubuntu.com trusty-updates/universePackages 404 : 91.189.91.13 80]
Ign http://us.archive.ubuntu.comtrusty/main Translation-en_US
Ign http://us.archive.ubuntu.comtrusty/universe Translation-en_US
W: 无法获取http://us.archive.ubuntu.com/ubuntu/dists/trusty/main/binary-armhf/Packages 404 Not Found [IP: 91.189.91.13 80]
W: 无法获取http://us.archive.ubuntu.com/ubuntu/dists/trusty/universe/binary-armhf/Packages 404 Not Found [IP: 91.189.91.13 80]
W: 无法获取http://us.archive.ubuntu.com/ubuntu/dists/trusty-updates/main/binary-armhf/Packages 404 Not Found [IP: 91.189.91.13 80]
W: …