where can I ask my question using other languages? I'm not good with english and would like to ask in portuguese or italian.
See http://www.ubuntu.com/support/community/locallanguage for Non-English support ressources.
On the Area 51 site, you can propose new Stack Exchange sites, including sites in languages other than English.
A few examples of existing proposals:
- Persian Information Technology and Computer
- Ubuntu (in German) (with some discussion on extending to Linux or even unix in general)
- Software Development (in Portuguese)
Note that a site would not have to be specifically about Ubuntu — you can ask Ubuntu questions on a site about unix in general or even about all computer hardware and software. My recommendation on the right size of a site is unix in general.
If you decide to create an Area 51 proposal, tell all your Portuguese or Italian-speaking friends! The site will be created if and when it has a critical mass of committed users.
See http://asklinux.ru/ubuntu for Russian languages users
You could try Google Translate.