Unfortunately, it does not matter if a record was sealed/expunged, you are still required to provide the relevant documentation for any criminal issues in immigration cases. You need certified copies of the arrest and booking report as well as a certified copy of the case disposition. If you already sealed/expunged the record, you need to do a serious search for your originals. You will definitely need the assistance of an immigration attorney for this application. Whether you should go ahead and apply for citizenship or renew your greencard now and consider citizenship later is heavily dependent on what occurred in the criminal case and what immigration-acceptable documents you have available to demonstrate that. It is highly unlikely anyone on here will be able to answer your question as it will require a good look at the crime-related documents and research based on that and the specific facts of your case. Consult with an immigration attorney (or two or three) with a good amount of experience with Naturalization.
Have the conviction paperwork reviewed by an immigration attorney. Ideally seek representation towards naturalization filing.
This response is general in nature and cannot be construed as legal advice, given that not enough facts are known. Any comments offered on Avvo are of a general nature only, and are not meant to create an attorney-client relationship. If you would like additional information based on this response, please contact my office at 510 657 7665 or 415 902 0832 to schedule a consultation.
Consult with a local attorney familiar with immigration issues to review the situation.
This observation is provided without warranty nor guarantee and for entertainment and informational purposes only. This answer is not legal advice. Not to be used as infant formula. No attorney client relationship is established as a result of these communications. The best legal advice you can get is to consult with an attorney licensed in your state or territory.