Hello,
I did a migration from Kali Sana 2.0 to Rolling 2016.1 by following the instructions situated on you web site and reading all asking question that i encountred on the installation instructions (after downloading dist-upgrade packages)..
what I remember is that the installation is finished with problem & errors (I remember the word "compilation error" ) then an exit from the installation.. so when cursor is returned to me , i though that a reboot can fix the problem.. but unfortunatly , when i rebooted my system , I couldn't login to my system , and the screen displayed this error :

I don't know what's the wrong that I did ?! because I followed all instruction without problem ..
so how can I fix this problem , I can do nothing because I can't login into my system :/
thank you in advance.