我已经使用许多 apt-get 配置了 Travis-CI，并且运行完美。但从本周开始，apt-get 失败，部分库无法检索。我没有更改代码。我怎么解决这个问题：
有问题的库是curl。
- 工作内容（4天前）：https://travis-ci.org/angoca/db2unit/jobs/47121134 https://travis-ci.org/angoca/db2unit/jobs/47121134
- 当前工作失败：https://travis-ci.org/angoca/db2unit/jobs/47634811 https://travis-ci.org/angoca/db2unit/jobs/47634811
我面临的错误是：
$ sudo apt-get install aria2 curl -y
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following package was automatically installed and is no longer required:
libgeos-3.2.2
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
libc-ares2
The following NEW packages will be installed:
aria2 libc-ares2
The following packages will be upgraded:
curl
1 upgraded, 2 newly installed, 0 to remove and 125 not upgraded.
Need to get 1,949 kB of archives.
After this operation, 5,179 kB of additional disk space will be used.
Get:1 http://us.archive.ubuntu.com/ubuntu/ precise/main libc-ares2 amd64 1.7.5-1 [36.6 kB]
Get:2 http://us.archive.ubuntu.com/ubuntu/ precise/universe aria2 amd64 1.13.0-1 [1,775 kB]
Err http://us.archive.ubuntu.com/ubuntu/ precise-updates/main curl amd64 7.22.0-3ubuntu4.11
404 Not Found [IP: 2001:67c:1562::14 80]
Err http://security.ubuntu.com/ubuntu/ precise-security/main curl amd64 7.22.0-3ubuntu4.11
404 Not Found [IP: 2001:67c:1562::14 80]
Fetched 1,811 kB in 0s (6,802 kB/s)
Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/c/curl/curl_7.22.0-3ubuntu4.11_amd64.deb 404 Not Found [IP: 2001:67c:1562::14 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
特拉维斯文档 https://docs.travis-ci.com/user/common-build-problems/#Linux%3A-apt-fails-to-install-package-with-404-error列出了该错误的常见原因是旧的包数据库。解决方案是添加：
before_install:
-sudo apt-get update
to your .travis.yml file.
Cheers,
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