我有一台 Linux AWS 机器，几天前我开始遇到这个问题：
Err http://deb.debian.org jessie-updates/main amd64 Packages
Err http://deb.debian.org jessie-updates/main amd64 Packages
Err http://deb.debian.org jessie-updates/main amd64 Packages
404 Not Found
100% [5 Packages 9098 kB]Fetched 10.1 MB in 1s (7356 kB/s)
W: Failed to fetch http://deb.debian.org/debian/dists/jessie-updates/main/binary-amd64/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
Exited with code 100
我的 CircleCI config.yml 错误在这里（在安装 aweswebsli 时）：
- run:
name: Install awsebcli
working_directory: ~/
command: |
sudo apt-get update
sudo …