cannot access http://127.0.0.1:8080/apex

first of all keep in mind that Oracle on ubuntu is not supported by Oracle or ubuntu, so problem and incompatabilities maybe quite common.

Are you using the Oracle internal web server to bind to 127.0.0.1 ? or an external one like apache. Are you sure the webserver is bound to 127.0.0.1 and listening on 8080 - "netstat -a | grep LIST" will show you what is listening.

Check that the apex directory appears in the document root of your websever.

hi thanx a lot for your fast reply...
Yes I have apache...
Well is there a kind of configuration that I need to do on apache?
actually when do a port scan from administrtion network monitor I can see port 80, 1521 but I can not see 8080?
you help is highly appreciated..

If there is no listener on 8080, the browser cannot bind to it. You probably need to start the oracle application that services port 8080. You should find the information in the oracle documentation. It might be that the particular service does not run properly on ubuntu. As previously mentioned this is not supported by either oracle nor ubuntu, therefore not tested.

start database
launch SQL command line
type: connect / as sysdba
then type: exec dbms_xdb.sethttpport(8181);

and finally try: http://127.0.0.1:8181/apex

bagheera - i tried what you said, but still doesnt work