Hi Joao,
The most likely reason you are getting this error is that the existing instance was not installed by root. You can check by, logged in as the instance owner, running: #db2greg -dump Look for the lines starting with a capital "S". You can find out which user installed the system.If you have a non root uid in that column (check who it is in /etc/passwd), then your install is a non-root install and running the process as root will be disallowed.
Regards,
Manjunath Hanmantgad
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