Ubuntu – Cannot upgrade from 16.04 to 16.10 (No new release found)

Cannot upgrade from 16.04LTS to 16.10.

Updated and dist-upgraded the system and tried running do-release-upgrade -d but it says no release found. Ensured that the prompt=normal in the "/etc/update-manager/release-upgrades" file.

Tried the same using the GUI of update-manager and changed the settings to "Notify for any new version" which is equivalent of prompt = normal and it says Your computer is up to date.

Also, all the necessary repos are present in the sources.lists.

I have recently upgraded a similar computer successfully which was quite straightforward. Cannot understand why this is happening even though the config files are similar and there are no problems in installing/updating using apt-get.

Any help would be greatly appreciated! Thanks 🙂