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Forgetting to CONNECT INTERNAL command

Sometimes people forget to issue the CONNECT INTERNAL command before they try to start an instance.
I do this sometimes, especially when I am in a rush. This is the error that you are likely to see:
SVRMGR> startup nomount

ORA-01031: insufficient privileges

If this happens to you, just run the CONNECT INTERNAL command, and then try the STARTUP command again.