The generic kernel gets installed with clean install but since you were using -386 in dapper and upgraded that most likely that is why 386 is default. Im changing this to a wishlist as this is not a bug.
** Changed in: grub (Ubuntu)
Importance: Undecided => Wishlist
Status: Unconfirmed => Confirmed
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Default kernel is 386 in edgy
https://launchpad.net/bugs/64180
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