Hello Srinivasan,
Welcome to Atlassian community
There might be multiple reasons why Bamboo installation would be stuck on H2 DB setup, we would need access to <bamboo-home>atlassian-bamboo.log file to understand this issue, as this is a public forum I would not advise you to directly put the logs here, if you have a valid SEN you can raise a support request with Atlassian support to get this checked.
Meanwhile looking a past cases, this normally happens when the Bamboo user which you have used to start does not have read/write access to <bamboo-home> directory, you should provide full read/write access to bamboo-home directory to the user which is starting Bamboo and restart the installation, it will work.
This is just one hypothesis, you may have some other problem which can be confirmed by looking at the logs
Regards,
Shashank Kumar
*please don't forget to Accept the answer if your query was answered**
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