Main user gone after upgrading to MacOS Siera I have just upgraded to MacOS Siera, and all of my users are no longer recognized.

I can see my user folder in the Users folder but OS won't recognize it.

I have looked around but only found issues revolving FileVault, which I have not used in the past (though I have tried the suggested solutions and they did not work).

To make it clear - none of my old users are available.

One thing I have noticed is that the OS has technically installed on a different partition than the old OS, which might have something to do with that (I had a small, 256MB partition created to allow the installation process, as instructed on apple site).

How can I restore the users?
If it's on a different partition, it's basically a different system. You'll need to upgrade the correct partition.