当我执行 sudo apt-get upgrade 或 update 时，我得到以下信息：
Err http://security.ubuntu.com/ubuntu/ saucy-security/main apport all 2.12.5-0ubuntu2.1
404 Not Found [IP: 91.189.91.15 80]
Err http://us-east-1.ec2.archive.ubuntu.com/ubuntu/ saucy/main libwhoopsie0 amd64 0.2.24.1
404 Not Found
Err http://us-east-1.ec2.archive.ubuntu.com/ubuntu/ saucy-updates/main software-properties-common all 0.92.28
404 Not Found
Err http://us-east-1.ec2.archive.ubuntu.com/ubuntu/ saucy-updates/main python3-software-properties all 0.92.28
404 Not Found
Failed to fetch http://us-east-1.ec2.archive.ubuntu.com/ubuntu/pool/main/libd/libdrm/libdrm2_2.4.46-1ubuntu1_amd64.deb 404 Not Found
Failed to fetch http://us-east-1.ec2.archive.ubuntu.com/ubuntu/pool/main/p/procps/libprocps0_3.3.3-2ubuntu9_amd64.deb 404 Not Found
Failed to fetch http://us-east-1.ec2.archive.ubuntu.com/ubuntu/pool/main/s/systemd/udev_204-0ubuntu19_amd64.deb 404 Not Found
Failed to fetch http://us-east-1.ec2.archive.ubuntu.com/ubuntu/pool/main/s/systemd/libudev1_204-0ubuntu19_amd64.deb 404 Not Found
Failed to fetch http://us-east-1.ec2.archive.ubuntu.com/ubuntu/pool/main/g/geoip/libgeoip1_1.5.1-1ubuntu1_amd64.deb 404 Not …