I checked for localhost on my browser but it appears apache2 did not take effect there. I know its installed because I got this in terminal searching for it:

apache2-bin/xenial-updates,xenial-security,now 2.4.18-2ubuntu3.17 amd64 [installed]

I tried this but still didn't see locahost in browser:
sudo /etc/init.d/apache2 start

Can you be a bit more specific? What do you mean by "checked for localhost" and "see localhost in browser"? Which commands did you issue and what was their output; which actions did you take, and what was the result?

Also, which command did you use to search, and what is the exact output of that command?

What does your /etc/hosts file say?

I was referring to default page "It works !" that you are meant to see when Apache is installed properly.

Since your post I think I managed to get it installed. I was expecting it to be in black and white but I see it in color, this must be the updated version of "It works !" with ubuntu logo on left hand side.

I issued:
sudo apt update
sudo apt install apache2

Commands used to search and output
apache2 -v
Server version: Apache/2.4.18 (Ubuntu)
Server built: 2020-08-12T21:35:50

Should I do anything else to check if I've installed it properly?

27.0.0.1 localhost
127.0.1.1 linuxman

# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

I don't know whether this is relevant or not, but localhost is usually 127.0.0.1.

For testing purposes, can you open CUPS? http://localhost:631

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I checked in terminal again and it is 127.0.0.1 localhost. Misprint earlier

Yes I can

Well, if you reach the default page, Apache is installed, running and responding.

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Been there. Done that.

Thanks.

So you can see the "it works" page. That means apache is installed and working. What else do you need help with?