I made the upgrade from 16 to 17 a while ago on my dual boot machine, all went perfectly well. I can still choose whether to boot Win or Zorin from the Grub menu but now, when I choose Zorin this error appears:
BusyBox v1.30.1 (Ubuntu 1:1.30.1-7ubuntu3) built-in shell (ash)
I tried starting Zorin in recovery mode (?) and this is what appeared on the screen:
Windows is unaffected as they are both installed on different drives
Anyone got any hint on what to do next?
The fact it is asking you to do a fsck (file system check) might be due to an orphaned file from Z16 or (hoping it isn't) potential drive failure. Boot a live mode of Zorin if possible, then run Disks Utility to do a SMART test:
Sorry for the late answer. Been on vacation in sunny Mexico! 
I ran the SMART test from live mode and the result was 100% fine. But still, the same error occurs when trying to boot Zorin 17.
I would boot off a live media of Zorin, unmount the offending partition and run efsck on it. I will need to look up the exact instructions as I think there is a bit more than just efsck for the command.
Update: follow the guide here:
Thanks, swarfendor! That did the trick. I simply unmounted the drive, ran fsck manually without -a or anything of that kind and indeed there were orphaned files and other errors that could successfully get fixed by the command fsck. All I had to do was saying "yes" to everything 
Thanks again, I am writing this from my repaired Zorin 17 drive on my dual boot machine!
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