Comment 4 for bug 1840232

Are you able to access /var/log/syslog? That may provide more useful information about the error.

Regarding the time zone settings, did you set this up in the preseed files, or did you simply select the time zone during installation? (Of course, either approach should work).

Could you be missing language packages that you may need for your time zone? (/var/log/syslog may help with this).

Do you know if your computer is connected to the Internet during installation? (I recall there was an old issue with the Ubiquity installer during offline installations).