Comment 3 for bug 887879

I encountered this earlier in the installation, from a 12.04.1 CD install, and the traceback was in /usr/lib/ubiquity/plugins/ubi-timezone.py, line 173.

Based on this and some other bugs, it seems like working network is a hard requirement for Ubiquity, not just a "for best results" as described on the installation page. It's also possible that ubiquity's network detection code should be more robust. In my (and many academic environments), you get a crippled network connection, redirecting you to a registration page (similar to that found in hotels, free wifi hotspots, etc). So to a naive program, it may "look" like a real network connection, and all host queries will resolve (to the A record for the registration page), but anything that expects a working network will be disappointed.