I live in the US and recently tried to find bread--standard, sliced bread--without sugar in it at my local store. They don't have any. The lowest I could find was a gram of sugar per slice!
There are plenty of bread recipes that require no sweetener, and it's definitely not needed for yeast to develop.
A lot of the packaged supermarket bread has additives to keep it fresher longer, one of which is sugar. Go either a little upmarket or to the baked-in-store section and you'll find some without it.
Bread has been staple food for millennia. For most of that time, sugar was rare, expensive or totally unavailable.