Input the command of "ls /usr/bin/apt-get". The output is "ls -al /usr/bin/apt-get
ls: cannot access /usr/bin/apt-get: No such file or directory", which indicates apt-get is not installed in the computer.

To install apt-get, execute the following commands:

1. grab the package from the web

   wget http://security.ubuntu.com/ubuntu/pool/main/a/apt/apt_1.0.1ubuntu2.17_amd64.deb -O apt.deb

2. install it with dpkg

   sudo dpkg -i apt.deb