How to run ORACLE 12C EM?

Question

I have installed and created a database in oracle 12c in ubuntu 14.04 . Now I can login to the CLI using sqlplus \ as sysdba and run sqlcommands , but I can't login to the EM from the web. The name given to me while database was loading was tamim-Inspiron-5421:5500/em that is just my machine name, but when I type this on the browser , webpage not found error happens. when I run the command lsnrctl status | grep HTTP it returns empty i.e blank. the output of the command in SQL is select dbms_xdb_config.getHttpsPort() from dual; is

DBMS_XDB_CONFIG.GETHTTPSPORT()
------------------------------
                         5500

I am logged in as oracle user like this oracle@tamim-Inspiron-5421 . I have checked the netstat --listen and saw that no program is listening to port 5500. What could be the problem ?

Here is the error in lsnrctl

LSNRCTL> status
Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
TNS-12541: TNS:no listener
 TNS-12560: TNS:protocol adapter error
  TNS-00511: No listener
   Linux Error: 111: Connection refused

I think I need to configure my firewall , or edit my /etc/hosts file somehow , but I don't know how !! here is my /etc/hosts file

127.0.0.1   localhost
127.0.1.1   tamim-Inspiron-5421 

after I added localhost like this 127.0.1.1 tamim-Inspiron-5421 localhost Here is the status

Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for Linux: Version 12.1.0.1.0 - Production
Start Date                21-SEP-2014 18:47:22
Uptime                    0 days 0 hr. 9 min. 2 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Log File         /oracle/app/oracle/diag/tnslsnr/tamim-Inspiron-5421/listener/alert/log.xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=tamim-Inspiron-5421)(PORT=1521)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcps)(HOST=tamim-Inspiron-5421)(PORT=5500))(Security=(my_wallet_directory=/oracle/app/oracle/admin/tamimdb/xdb_wallet))(Presentation=HTTP)(Session=RAW))
Services Summary...
Service "tamimdb" has 1 instance(s).
  Instance "tamimdb", status READY, has 1 handler(s) for this service...
Service "tamimdbXDB" has 1 instance(s).
  Instance "tamimdb", status READY, has 1 handler(s) for this service...
The command completed successfully