报错信息
$ apt-get -y update
Hit:1 http://mirrors.163.com/ubuntu bionic InRelease
Hit:2 http://mirrors.163.com/ubuntu bionic-updates InRelease
Hit:3 http://mirrors.163.com/ubuntu bionic-backports InRelease
Hit:4 http://security.ubuntu.com/ubuntu bionic-security InRelease
Get:5 https://developer.download.nvidia.cn/compute/cuda/repos/ubuntu1804/x86_64 InRelease [1581 B]
Err:5 https://developer.download.nvidia.cn/compute/cuda/repos/ubuntu1804/x86_64 InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A4B469963BF863CC
Reading package lists... Done
W: GPG error: https://developer.download.nvidia.cn/compute/cuda/repos/ubuntu1804/x86_64 InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A4B469963BF863CC
E: The repository 'https://developer.download.nvidia.cn/compute/cuda/repos/ubuntu1804/x86_64 InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.解决方法1：
直接删除 /etc/apt/sources.list.d/cuda.list 文件
解决方法2：
update前先添加PGP PUBLIC KEY，KEY的地址在cuda.list中的URL下
$ apt-key adv --fetch-keys http://developer.download.nvidia.com/compute/cuda/repos/ubuntu1604/x86_64/3bf863cc.pub
$ apt-key adv --fetch-keys https://developer.download.nvidia.cn/compute/cuda/repos/ubuntu1804/x86_64/7fa2af80.pub
版权声明：本文为woxiwangxuehaocpp原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。