"What Ubuntu "main" means is those packages are actually built by Ubuntu with their own patches and quality control."
I guess this is where I was confused. My understanding is that the packages in main still originate as .debs from Debian (i.e., they are not directly packaged from upstream sources), even if Ubuntu applies their own patches and such, so it sounds strange to say that these are not "repackaged." (I can't find an Ubuntu page confirming this, but Wikipedia says, "Ubuntu packages are based on packages from Debian's unstable branch..." [1])
So, I think the mapping from your terminology to mine is:
"built by Ubuntu" => "repackaged by Canonical from Debian"
"repackaged from Debian" => "repackaged by Ubuntu community from Debian"
I guess this is where I was confused. My understanding is that the packages in main still originate as .debs from Debian (i.e., they are not directly packaged from upstream sources), even if Ubuntu applies their own patches and such, so it sounds strange to say that these are not "repackaged." (I can't find an Ubuntu page confirming this, but Wikipedia says, "Ubuntu packages are based on packages from Debian's unstable branch..." [1])
So, I think the mapping from your terminology to mine is:
"built by Ubuntu" => "repackaged by Canonical from Debian"
"repackaged from Debian" => "repackaged by Ubuntu community from Debian"
[1] https://secure.wikimedia.org/wikipedia/en/wiki/Ubuntu_%28ope...