Ubuntu 16, roundcube as imap,smtp with gmail support

[mike2060]

Hi.
I'd like to have personal email account [email protected] and add it to gmail as alias in order to be able to send/receive mails via browser. Combined mail client on gmail. To clarify: I want to use [email protected] not [email protected].

So far I tried:
installing postfix - went 3/4 way, I was able to add alias to gmail but only sending was working. I could not receive mails on gmail
installing sendmail with/without dovecot - was able to send/receive mails only in console client like mutt, couldn't add alias to gmail. (probably no smtp/imap) But much much less configuration than postfix

And then I heard that roundcube might help me achieve my goal. I went on to install it and stopped on installer because it asks for smtp.

Is it at all possible with roundcube? Where should I start?
If not what should I try ?