So I performed the upgrade and it bricked my install completely. The reason seems to be that something cant handle png icons and after about 4 hrs of working on it, searching and trying different approaches, the site is now back online. Now I need to take an extended break and tomorrow I might check if the error messages are gone. I did find some of the same in the log just a couple mins ago so I dont think this has helped. I might have to turn off backtraces so its less convoluted.