Why do I have an account conflict?
Previously you had a personal Google account with which you used your @ucsd.edu as your username. Now UCSD took ownership of all the @ucsd.edu addresses. You will use the @ucsd.edu address to login to the UCSD Google Apps.
Another possible cause for the conflict is you may have used your @ucsd.edu address as a “secondary” email addresses with another Google Account. Google uses the secondary email for password recovery and account verification. To resolve this conflict, you can change the secondary address to something other than your @ucsd.edu address.
If you have an account conflict, and wish to retain the emails and Google docs in the personal Google account, you will need to create a new username for the personal account (e.g. firstname.lastname@example.org). Click the Individual Google Account option, then follow the instructions to create a new gmail address.