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bash: sudo: command not found
执行：
apt-get install sudo
2.报错：
E: Unable to locate package libjasper-dev
sudo add-apt-repository "deb http://security.ubuntu.com/ubuntu xenial-security main"
但报错：
root@dd1466f1fbbc:/home# sudo add-apt-repository "deb http://security.ubuntu.com/ubuntu xenial-security main"sudo: add-apt-repository: command not found
通过执行下面两个命令 解决：
sudo apt-get install software-properties-commonsudo apt-get update
-----
执行 apt update 时 报错。
root@dd1466f1fbbc:/home/opencv/build# apt updateIgn:1 http://archive.canonical.com lucid InReleaseHit:2 http://security.ubuntu.com/ubuntu xenial-security InReleaseErr:3 http://archive.canonical.com lucid Release 404 Not Found [IP: 91.189.92.191 80]Ign:4 https://developer.download.nvidia.cn/compute/cuda/repos/ubuntu1804/x86_64 InReleaseIgn:5 https://developer.download.nvidia.cn/compute/machine-learning/repos/ubuntu1804/x86_64 InReleaseHit:6 https://developer.download.nvidia.cn/compute/cuda/repos/ubuntu1804/x86_64 ReleaseHit:8 https://developer.download.nvidia.cn/compute/machine-learning/repos/ubuntu1804/x86_64 ReleaseReading package lists... DoneE: The repository 'http://archive.canonical.com lucid Release' does not have a Release file.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.
发现时 sources.list 内容发生变化 ；更换为清华源后 ，执行 apt update 可以
执行更新：
root@dd1466f1fbbc:/etc/apt# vim sources.listroot@dd1466f1fbbc:/etc/apt# root@dd1466f1fbbc:/etc/apt# vim sources.listroot@dd1466f1fbbc:/etc/apt# root@dd1466f1fbbc:/etc/apt# apt updateGet:1 https://mirrors.tuna.tsinghua.edu.cn/ubuntu bionic InRelease [242 kB]Get:2 https://mirrors.tuna.tsinghua.edu.cn/ubuntu bionic-updates InRelease [88.7 kB]Get:3 https://mirrors.tuna.tsinghua.edu.cn/ubuntu bionic-backports InRelease [74.6 kB]Get:4 https://mirrors.tuna.tsinghua.edu.cn/ubuntu bionic-security InRelease [88.7 kB]Get:5 https://mirrors.tuna.tsinghua.edu.cn/ubuntu bionic/universe amd64 Packages [11.3 MB]Ign:6 https://developer.download.nvidia.cn/compute/cuda/repos/ubuntu1804/x86_64 InReleaseIgn:7 https://developer.download.nvidia.cn/compute/machine-learning/repos/ubuntu1804/x86_64 InReleaseHit:8 https://developer.download.nvidia.cn/compute/cuda/repos/ubuntu1804/x86_64 ReleaseHit:9 https://developer.download.nvidia.cn/compute/machine-learning/repos/ubuntu1804/x86_64 ReleaseGet:12 https://mirrors.tuna.tsinghua.edu.cn/ubuntu bionic/restricted amd64 Packages [13.5 kB]Get:13 https://mirrors.tuna.tsinghua.edu.cn/ubuntu bionic/main amd64 Packages [1344 kB]Get:14 https://mirrors.tuna.tsinghua.edu.cn/ubuntu bionic/multiverse amd64 Packages [186 kB]Get:15 https://mirrors.tuna.tsinghua.edu.cn/ubuntu bionic-updates/main amd64 Packages [2582 kB]Get:16 https://mirrors.tuna.tsinghua.edu.cn/ubuntu bionic-updates/universe amd64 Packages [2183 kB]Get:17 https://mirrors.tuna.tsinghua.edu.cn/ubuntu bionic-updates/multiverse amd64 Packages [31.6 kB]Get:18 https://mirrors.tuna.tsinghua.edu.cn/ubuntu bionic-updates/restricted amd64 Packages [452 kB]Get:19 https://mirrors.tuna.tsinghua.edu.cn/ubuntu bionic-backports/universe amd64 Packages [11.4 kB]Get:20 https://mirrors.tuna.tsinghua.edu.cn/ubuntu bionic-backports/main amd64 Packages [11.3 kB]Get:21 https://mirrors.tuna.tsinghua.edu.cn/ubuntu bionic-security/main amd64 Packages [2150 kB]Get:22 https://mirrors.tuna.tsinghua.edu.cn/ubuntu bionic-security/universe amd64 Packages [1411 kB]Get:23 https://mirrors.tuna.tsinghua.edu.cn/ubuntu bionic-security/multiverse amd64 Packages [24.7 kB]Get:24 https://mirrors.tuna.tsinghua.edu.cn/ubuntu bionic-security/restricted amd64 Packages [423 kB]Fetched 22.7 MB in 11s (2054 kB/s)Reading package lists... DoneBuilding dependency treeReading state information... Done
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