Installing updates during a preseeded installation

[Max Brustkern]

I'd like to setup an automated test for this bug:
https://bugs.launchpad.net/ubuntu/+source/snapd/+bug/1673247
To do so, I need to have package updates enabled during an automated
installation. Is this something I can do with a preseed directive, or do I
need to use an autopilot test to check that box in ubiquity?

Thanks,
Max
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