08-22-2016, 05:08 PM
This may or may not be relevant, but I've seen the Press Enter for Maintenance prompt before as well, and got nervous. After a very long time (~30 minutes- give or take) the system did boot on it's own. In my case, it happened when CIFS shares and an external HD listed in /etc/fstab were not available. Do you have any file systems that Ubuntu might be searching for?