If I upgrade to the 21.10 Developer branch will i get the stable too? [duplicate]

upgrade

The normal sudo apt-get update and sudo apt-get upgrade will get new repo lists and packages as they are released and ultimately, you will have the same packages installed as the final release, including the various bugfixes as the version transitions from -

Alpha -> Beta -> Release Candidate -> Stable Release

You do not need to 'fresh install' the stable version later.

For Ubuntu 15.04 (Vivid Vervet), the release schedule is -

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