I just upgraded from 15.07 to 16.01 with no problems. I used the online upgrade process.
I’m running an up to date Fedora 29 linux workstation.
Congratulations to the development team!
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Okay - looks like I ended with with needing to update some database indexes. Got message that some indexes where not created.
Ran the following on my Fedora - which is why I use apache instead of www-data
sudo -u apache php occ maintenance:mode --on
sudo -u apache php occ db:add-missing-indices
sudo -u apache php occ maintenance:mode --off
Now no messages.