Trouble with sources.list and apt-get update in Ubuntu 18.04 LTS

Question

I am facing with a problem in Ubuntu 18.04 LTS. I am running Ubuntu in my virtual machine.

I am having a problem with sudo apt-get update command. This is the current output I get:

VirtualBox@VirtualBox:~$ sudo apt-get update
Hit:1 http://us.archive.ubuntu.com/ubuntu bionic InRelease
Hit:2 http://security.ubuntu.com/ubuntu bionic-security InRelease
Hit:3 https://download.virtualbox.org/virtualbox/debian bionic InRelease       
Hit:4 http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease             
Hit:5 https://deb.nodesource.com/node_12.x bionic InRelease                    
Hit:6 https://dnw9lb6lzp2d8.cloudfront.net stable InRelease                    
Reading package lists... Done 

I realized that apt-get issues are most of the time related with /etc/apt/sources.list.

Then I followed the solution here: How do I restore the default repositories? to restore default repositories in sources.list.

But I guess it didn't work because this is the content of sources.list:

deb http://us.archive.ubuntu.com/ubuntu/ bionic main universe
deb http://security.ubuntu.com/ubuntu/ bionic-security universe main
deb http://us.archive.ubuntu.com/ubuntu/ bionic-updates universe main

My questions here are:

• Is the result of sudo apt-get update normal? Is it really updating? Why it doesn't do Fetching anymore?
• I opened the Software & Updates to fix the repositories in /etc/apt/sources.list just like the first answer here How do I restore the default repositories? Do you think now content of the sources.list is normal?

It would be so nice if some expert could answer my questions and direct me in the correct path. Because I am new in Ubuntu and I can't solve every problem on my own.

Thank you so much for your support!!