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Pl post details of exact versions of "10gR2" and "11gR2", along with the last 100 lines of the upgrade log.
Pl note that the minimum version of 10gR2 required for a direct upgrade to 11gR2 is 10.2.0.2 - http://docs.oracle.com/cd/E11882_01/server.112/e23633/preup.htm#i1007814.
Have you run the pre-upgrade script and met/corrected all of the issues noted in the output ?
Pl also post any errors/information recorded in the database alert log when this issue occurs
Post the error portion of the log.
dbua -silent -sid <sidname>
Your information is not enough. As mention here
1. Mention your exact db version
2. Any error message at upgrade log&alert.log
My database is 10.2.0.4
Unfortunately, I can't post the error portion of the log because of classification issues. The last script that the upgrade attemps to run before the upgrade aborts is the xdbuuc2.sql script.
Then please open an SR with Support. Viewing the log is critical to finding root cause - I am sure that Support will ask you for the same.