将用户添加到sudo组

usermod -aG sudo [username] 

验证sudo权限

sudo -l -U [username]

https://jumpcloud.com/blog/how-to-create-sudo-users-debian

1. Install sudo. Some installations do not come with sudo installed. If your does not, install sudo with apt.

# apt install sudo

- 阅读剩余部分 -

/etc/apt/apt.conf.d/proxy.conf

Acquire {
  HTTP::proxy "http://proxy_server:port/";
  HTTPS::proxy "http://proxy_server:port/";
}

https://linuxiac.com/how-to-use-apt-with-proxy/

下面是 man apt-get 的摘录。使用 upgrade 时应遵守以下规则：在任何情况下都不得删除当前已安装的软件包，也不得检索和安装尚未安装的软件包。如果这对你很重要，那就用 apt-get upgrade。如果你想让一切 "正常运行"，你可能需要使用apt-get dist-upgrade来确保依赖关系得到解决。

upgrade

upgrade 用于从/etc/apt/sources.list 列举的源中安装系统当前安装的所有软件包的最新版本。当前安装的软件包如果有新版本可用，则会被检索和升级；在任何情况下，当前安装的软件包都不会被移除，尚未安装的软件包也不会被检索和安装。当前已安装的软件包的新版本，如果不能在不改变其他软件包安装状态的情况下升级，则会保留其当前版本。必须先进行更新，以便 apt-get 知道新版本的软件包可用。

dist-upgrade

除了执行升级功能外，dist-upgrade 还能智能地处理与新版本软件包的依赖关系变化；apt-get 有一个 "智能 "的冲突解决系统，它会尝试升级最重要的软件包，而命令可能会删除某些软件包。/etc/apt/sources.list文件包含一个位置列表，可以从中获取所需的软件包文件。另请参阅 apt_preferences(5)，了解覆盖个别软件包常规设置的机制。

deb http://deb.debian.org/debian bookworm main
deb-src http://deb.debian.org/debian bookworm main

deb http://deb.debian.org/debian-security/ bookworm-security main
deb-src http://deb.debian.org/debian-security/ bookworm-security main

deb http://deb.debian.org/debian bookworm-updates main
deb-src http://deb.debian.org/debian bookworm-updates main

Since the colors worked fine while being loggged in directly, I just un-uncommented the line force_color_prompt=yes in the file ~/.bashrc, that gave me colors over ssh, too:

# uncomment for a colored prompt, if the terminal has the capability; turned
# off by default to not distract the user: the focus in a terminal window
# should be on the output of commands, not on the prompt
force_color_prompt=yes

(Ubuntu 18.04 LTS)

https://askubuntu.com/questions/16336/how-to-get-coloured-terminal-over-ssh