I've read other questions but didn't find an answer to my issue. Also as newbie I'm more lost than usual.

Well the problem is that trying to install Nginx and trying to see if ufw status get status: inactive

After this I write systemctl status nginx and get the next result:

pipo@pipo-X542UV:~$ sudo  systemctl status nginx
● nginx.service - A high performance web server and a reverse proxy server
   Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since mar 2018-02-06 17:39:07 CET; 14min ago

 feb 06 17:39:06 pipo-X542UV nginx[27941]: nginx: [emerg] bind() to 
 [::]:80 failed (98: Address already in use)
 feb 06 17:39:06 pipo-X542UV nginx[27941]: nginx: [emerg] bind() to 
 0.0.0.0:80 failed (98: Address already in us
 feb 06 17:39:06 pipo-X542UV nginx[27941]: nginx: [emerg] bind() to 
 [::]:80 failed (98: Address already in use)
 feb 06 17:39:07 pipo-X542UV nginx[27941]: nginx: [emerg] bind() to 
 0.0.0.0:80 failed (98: Address already in us
 feb 06 17:39:07 pipo-X542UV nginx[27941]: nginx: [emerg] bind() to 
 [::]:80 failed (98: Address already in use)
 feb 06 17:39:07 pipo-X542UV nginx[27941]: nginx: [emerg] still could 
 not bind()
 feb 06 17:39:07 pipo-X542UV systemd[1]: nginx.service: Control 
 process exited, code=exited status=1
 feb 06 17:39:07 pipo-X542UV systemd[1]: Failed to start A high 
 performance web server and a reverse proxy serve
 feb 06 17:39:07 pipo-X542UV systemd[1]: nginx.service: Unit entered 
 failed state.
 feb 06 17:39:07 pipo-X542UV systemd[1]: nginx.service: Failed with 
 result 'exit-code'.
 lines 1-14/14 (END)

Have tried several times uninstalling and installing again

What I'm doing wrong?

Thanks in advance!