Linux - ubuntu - 'apt-get' is ubuntu 'yum'

 Run: 

sudo yum install openssl

Error:

There are no enabled repos.

 Run "yum repolist all" to see the repos you have.

 You can enable repos with yum-config-manager --enable <repo>

Run successfully:

sudo apt-get install openssl

The usual way to install packages on the command line in Ubuntu is with apt-get.

The usual way to install packages on the command line in Red Hat is with yum.