apt-get how to know what to install - Ask Ubuntu

this question has answer here:

• how know packages need install? 1 answer

if know feature want add server/desktop, example mail server, how on earth, can tell packages should via apt-get?

you can up, do.

using example of wanting install email server, open google , search

set email server ubuntu 

with search, first result digitalocean article, titled "how install , setup postfix on ubuntu 14.04." (also exists 16.04) know email server on ubuntu called postfix, , have guide on setting up.

now, maybe don't digitalocean whatever reason, or maybe i'd prefer stackexchange q&a, because easier read me. in mind, i'd search

set email server ubuntu 

and voila: how set email server?

that contains detailed answer on setting mail server on ubuntu, using mail-server package. 1 result below question one: simple method install mail server

it provides yet method setting mail server.

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what really, really, really need when using ubuntu (well, really) look up. there's no index lists packages different mail servers, there is; it's called internet. use index advantage. package names can weird, why using search engine can beneficial.

if turns out can't find you're looking for, ask here, have done. chances are, has answer , closed duplicate (i'm seeing more , more of lately, , question 1 well), there's nothing wrong that, if answer. in fact, duplicates others well, question might show different search terms question duplicate of.