How do I install apt on Ubuntu? [duplicate]

I'm trying to install Google authenticator on Ubuntu.

I tried sudo apt install libpam-google-authenticator which results in the error sudo: apt: command not found. Shouldn't apt already be installed on Ubuntu? I have tried several commands with apt. Beware I am very new to Linux.

When I use the command lsb_release -a this is the output:

-bash: lsb_release: command not found

I installed "Ubuntu 20.04 LTS" from the Microsoft Store.

When I use the command cat /etc/os-release this is the output:

NAME="CentOS Linux"
VERSION="8"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="8"
PLATFORM_ID="platform:el8"
PRETTY_NAME="CentOS Linux 8"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:8"
HOME_URL="https://centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"
CENTOS_MANTISBT_PROJECT="CentOS-8"
CENTOS_MANTISBT_PROJECT_VERSION="8"

$: echo $PATH
/home/mkristiansen/.local/bin:/home/mkristiansen/bin:/usr/local/bin:/usr/bin:/usr/local/sbin:/usr/sbin

Solution 1:

You are running CentOS, not Ubuntu. CentOS uses yum as package manager. If, for any reason, you still want to use apt on what you're running, check this out.