So why don't you remove the possibility of persistence causing the issue and start over? If you can confirm on a FRESH instance without any other alterations, then perhaps we have some sort of problem. It's extremely unlikely, though. You can see this change does indeed set the trusted flag: https://git.launchpad.net/ubuntu/+source/casper/commit/?id=0dda04202e9cd06f9c5358ac1d52331c0f63c624
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