How does the Ubuntu upgrade process work?

Posted by IDWMaster on Ask Ubuntu See other posts from Ask Ubuntu or by IDWMaster
Published on 2011-04-11T23:50:19Z Indexed on 2012/10/31 5:22 UTC
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How does Ubuntu upgrade seamlessly to a newer distribution, while the operating system is still running? I'm upgrading from 10.10 to 11.04, and I've upgraded several times before, and it's as simple as running update-manager -d and downloading and installing them, then rebooting.

How exactly does this work though? How is the upgrade manager able to update the operating system while it is still in use?

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