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ubuntu 16.04更新报错：
sudo apt-get update
命中:1 http://mirrors.aliyun.com/ubuntu xenial InRelease
命中:2 http://mirrors.aliyun.com/ubuntu xenial-security InRelease
命中:3 http://mirrors.aliyun.com/ubuntu xenial-updates InRelease
命中:4 http://mirrors.aliyun.com/ubuntu xenial-proposed InRelease
命中:5 http://mirrors.aliyun.com/ubuntu xenial-backports InRelease
命中:6 http://mirrors.aliyun.com/docker-engine/apt/repo ubuntu-xenial InRelease
获取:7 https://packages.microsoft.com/repos/vscode stable InRelease [2,802 B]
命中:8 https://download.docker.com/linux/ubuntu xenial InRelease
获取:9 http://security.ubuntu.com/ubuntu xenial-security InRelease [107 kB]
获取:10 https://nvidia.github.io/libnvidia-container/ubuntu16.04/amd64 InRelease [1,106 B]
获取:11 https://nvidia.github.io/nvidia-container-runtime/ubuntu16.04/amd64 InRelease [1,136 B]
获取:12 https://nvidia.github.io/nvidia-docker/ubuntu16.04/amd64 InRelease [1,129 B]
命中:13 http://cn.archive.ubuntu.com/ubuntu xenial InRelease
获取:14 https://packages.microsoft.com/repos/vscode stable/main amd64 Packages [70.4 kB]
获取:15 http://cn.archive.ubuntu.com/ubuntu xenial-updates InRelease [109 kB]
命中:16 https://deb.nodesource.com/node_6.x xenial InRelease
错误:10 https://nvidia.github.io/libnvidia-container/ubuntu16.04/amd64 InRelease
下列签名无效： KEYEXPIRED 1538166745 KEYEXPIRED 1538166745 KEYEXPIRED 1538166745 KEYEXPIRED 1538166745
错误:11 https://nvidia.github.io/nvidia-container-runtime/ubuntu16.04/amd64 InRelease
下列签名无效： KEYEXPIRED 1538166745 KEYEXPIRED 1538166745 KEYEXPIRED 1538166745 KEYEXPIRED 1538166745
错误:12 https://nvidia.github.io/nvidia-docker/ubuntu16.04/amd64 InRelease
下列签名无效： KEYEXPIRED 1538166745 KEYEXPIRED 1538166745 KEYEXPIRED 1538166745 KEYEXPIRED 1538166745
命中:17 http://ppa.launchpad.net/ethereum/ethereum-dev/ubuntu xenial InRelease
命中:18 http://ppa.launchpad.net/ethereum/ethereum/ubuntu xenial InRelease
获取:19 http://cn.archive.ubuntu.com/ubuntu xenial-backports InRelease [107 kB]
获取:20 http://security.ubuntu.com/ubuntu xenial-security/main amd64 DEP-11 Metadata [67.7 kB]
获取:21 http://security.ubuntu.com/ubuntu xenial-security/main DEP-11 64x64 Icons [68.0 kB]
获取:22 http://security.ubuntu.com/ubuntu xenial-security/universe amd64 DEP-11 Metadata [108 kB]
获取:23 http://cn.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages [856 kB]
获取:24 http://security.ubuntu.com/ubuntu xenial-security/universe DEP-11 64x64 Icons [150 kB]
忽略:25 https://dl.bintray.com/sbt/debian InRelease
获取:26 http://cn.archive.ubuntu.com/ubuntu xenial-updates/main i386 Packages [767 kB]
获取:27 http://cn.archive.ubuntu.com/ubuntu xenial-updates/main amd64 DEP-11 Metadata [320 kB]
获取:28 http://cn.archive.ubuntu.com/ubuntu xenial-updates/main DEP-11 64x64 Icons [227 kB]
获取:29 http://cn.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 Packages [690 kB]
获取:30 http://cn.archive.ubuntu.com/ubuntu xenial-updates/universe i386 Packages [632 kB]
获取:31 http://cn.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 DEP-11 Metadata [247 kB]
获取:32 http://cn.archive.ubuntu.com/ubuntu xenial-updates/universe DEP-11 64x64 Icons [333 kB]
获取:33 https://dl.bintray.com/sbt/debian Release [815 B]
命中:33 https://dl.bintray.com/sbt/debian Release
获取:35 http://cn.archive.ubuntu.com/ubuntu xenial-updates/multiverse amd64 DEP-11 Metadata [5,960 B]
获取:36 http://cn.archive.ubuntu.com/ubuntu xenial-updates/multiverse DEP-11 64x64 Icons [14.3 kB]
获取:37 http://cn.archive.ubuntu.com/ubuntu xenial-backports/main amd64 DEP-11 Metadata [3,328 B]
获取:38 http://cn.archive.ubuntu.com/ubuntu xenial-backports/universe amd64 DEP-11 Metadata [5,104 B]
错误:39 https://packagecloud.io/mrtazz/restclient-cpp/ubuntu xenial InRelease
Connection timed out after 120990 milliseconds
已下载 4,894 kB，耗时 2分 3秒 (39.8 kB/s)
正在读取软件包列表... 完成
W: 校验数字签名时出错。此仓库未被更新，所以仍然使用此前的索引文件。GPG 错误：https://nvidia.github.io/libnvidia-container/ubuntu16.04/amd64 InRelease: 下列签名无效：
KEYEXPIRED 1538166745 KEYEXPIRED 1538166745 KEYEXPIRED 1538166745 KEYEXPIRED 1538166745W: 校验数字签名时出错。此仓库未被更新，所以仍然使用此前的索引文件。GPG 错误：https://nvidia.github.io/nvidia-container-runtime/ubuntu16.04/amd64 InRelease: 下列签名
无效： KEYEXPIRED 1538166745 KEYEXPIRED 1538166745 KEYEXPIRED 1538166745 KEYEXPIRED 1538166745W: 校验数字签名时出错。此仓库未被更新，所以仍然使用此前的索引文件。GPG 错误：https://nvidia.github.io/nvidia-docker/ubuntu16.04/amd64 InRelease: 下列签名无效： KEYEX
PIRED 1538166745 KEYEXPIRED 1538166745 KEYEXPIRED 1538166745 KEYEXPIRED 1538166745W: 无法下载 https://packagecloud.io/mrtazz/restclient-cpp/ubuntu/dists/xenial/InRelease Connection timed out after 120990 milliseconds
W: 无法下载 https://nvidia.github.io/libnvidia-container/ubuntu16.04/amd64/InRelease 下列签名无效： KEYEXPIRED 1538166745 KEYEXPIRED 1538166745 KEYEXPIRED 15381667
45 KEYEXPIRED 1538166745W: 无法下载 https://nvidia.github.io/nvidia-container-runtime/ubuntu16.04/amd64/InRelease 下列签名无效： KEYEXPIRED 1538166745 KEYEXPIRED 1538166745 KEYEXPIRED 153
8166745 KEYEXPIRED 1538166745W: 无法下载 https://nvidia.github.io/nvidia-docker/ubuntu16.04/amd64/InRelease 下列签名无效： KEYEXPIRED 1538166745 KEYEXPIRED 1538166745 KEYEXPIRED 1538166745 KE
YEXPIRED 1538166745W: 部分索引文件下载失败。如果忽略它们，那将转而使用旧的索引文件。
表明密钥过期，需要更新
参考 ubuntu 12.04下owncloud更新出现KEYEXPIRED解决方法 ，KEYEXPIRED for OwnCloud Ubuntu Package。
最终，在 nvidia 镜像站找到更新 key的方法，参考 libnvidia-container： 的 Updating repository keys 的 Debian-based distributions
curl -s -L https://nvidia.github.io/libnvidia-container/gpgkey | \
sudo apt-key add -
试着更新一下：
$ curl -s -L https://nvidia.github.io/libnvidia-container/gpgkey | \
> sudo apt-key add -
OK
再更新软件：
$ sudo apt-get update
命中:1 http://mirrors.aliyun.com/ubuntu xenial InRelease
命中:2 http://mirrors.aliyun.com/ubuntu xenial-security InRelease
命中:3 http://mirrors.aliyun.com/ubuntu xenial-updates InRelease
命中:4 http://mirrors.aliyun.com/ubuntu xenial-proposed InRelease
命中:5 http://mirrors.aliyun.com/ubuntu xenial-backports InRelease
命中:6 http://mirrors.aliyun.com/docker-engine/apt/repo ubuntu-xenial InRelease
获取:7 https://nvidia.github.io/libnvidia-container/ubuntu16.04/amd64 InRelease [1,106 B]
获取:8 https://nvidia.github.io/nvidia-container-runtime/ubuntu16.04/amd64 InRelease [1,136 B]
命中:9 https://packages.microsoft.com/repos/vscode stable InRelease
命中:10 http://cn.archive.ubuntu.com/ubuntu xenial InRelease
获取:11 https://nvidia.github.io/nvidia-docker/ubuntu16.04/amd64 InRelease [1,129 B]
命中:12 http://security.ubuntu.com/ubuntu xenial-security InRelease
命中:13 https://download.docker.com/linux/ubuntu xenial InRelease
命中:14 http://ppa.launchpad.net/ethereum/ethereum-dev/ubuntu xenial InRelease
命中:15 http://cn.archive.ubuntu.com/ubuntu xenial-updates InRelease
命中:16 https://deb.nodesource.com/node_6.x xenial InRelease
命中:17 http://cn.archive.ubuntu.com/ubuntu xenial-backports InRelease
命中:18 http://ppa.launchpad.net/ethereum/ethereum/ubuntu xenial InRelease
忽略:19 https://dl.bintray.com/sbt/debian InRelease
获取:20 https://dl.bintray.com/sbt/debian Release [815 B]
命中:20 https://dl.bintray.com/sbt/debian Release
命中:22 https://packagecloud.io/mrtazz/restclient-cpp/ubuntu xenial InRelease
已下载 3,371 B，耗时 33秒 (99 B/s)
正在读取软件包列表... 完成
done!