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Once you install debian, your will not be able to update or install applications using apt as the /etc/apt/sources.list is empty. You can update this list with repository link and install applications. If you do not know any repository link use the below
- Configure ip address for the system.
- use the command apt update. This command “apt update” will update the available repository
- Now use apt install command to install any application. For example, “apt install net-tools”
After using apt update command, you should be able to install applications from repository.