linux问题汇总

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一：api以及各种命令缺失问题

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问题1：
error ：-bash: sudo: command not found

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terminal中输入：

apt-get install sudo -y

查看安装是否完成

sudo -V

出现上面内容就说明问题解决

二：网络问题

问题1：

Using Anaconda API: https://api.anaconda.org
Fetching package metadata .......
CondaHTTPError: HTTP None None for url <https://repo.continuum.io/pkgs/free/linux-64/repodata.json.bz2>
Elapsed: None

An HTTP error occurred when trying to retrieve this URL.
HTTP errors are often intermittent, and a simple retry will get you on your way.
ConnectionError(MaxRetryError("HTTPSConnectionPool(host='repo.continuum.io', port=443): Max retries exceeded with url: /pkgs/free/linux-64/repodata.json.bz2 (Caused by NewConnectionError('<requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7f6eacb410b8>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution',))",),)

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查看Ubuntu版本

cat /etc/issue

然后换成清华源：

参考

https://blog.youkuaiyun.com/Netfilter007/article/details/103895700?utm_medium=distribute.pc_relevant.none-task-blog-2_defaultbaidujs_title~default-0.no_search_link&spm=1001.2101.3001.4242.1

问题2:

Err:11 https://mirrors.tuna.tsinghua.edu.cn/ubuntu bionic Release
  Certificate verification failed: The certificate is NOT trusted. The certificate chain uses expired certificate.  Could not handshake: Error in the certificate verification. [IP: 101.6.15.130 443]

E: The repository 'https://mirrors.tuna.tsinghua.edu.cn/ubuntu bionic-security 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.

应该是由于缺乏 ca-certificates
直接 apt install ca-certificates 也会出现错误

因此要将源中的https换成http,由于http会增加网络风险，故apt update 之后要换回来，具体参考以下链接
参考：https://blog.youkuaiyun.com/qq_19729599/article/details/114682507