How to install vi commands in docker containers in linux

When using a docker container and your docker system is debian or ubuntu, docker container command ,sometimes vim is not installed. When you press the vim command, the prompt is: vim: command not found, you need to install vim at this time, but when you press apt-get install vim command, the prompt is: docker command to start container

Docker commands to run a container

Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package vim

Docker command for running containers 
At this time, you need to press: apt-get update. The function of this command is to synchronize/etc/apt/sources. list and/etc/apt/sources. list. d to obtain the latest software package.

After the update is complete, docker container bash command ,run the following command: Docker command from container

Apt-get install vim command.