The following issue has been found when customers attempt to upgrade a geodatabase from an older version to 10, specifically on the Linux Platform:
NIM058774 - ArcSDE geodatabase upgrade for Oracle fails if the geoprocessing upgrade script is executed from a Linux platform.
Please see Knowledge Base article 37974 for further details and workarounds.
Esri is working on a fix for this issue and will be working to make the required Linux files available for download soon.
Mike H., Program Manager
User Advocacy Group, Esri Support Services