show disk usage at the bottom of the apt download
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That df output can zip by really fast on a fast uplink, and is therefore lost in the noise. While we can scrollback to see it, we need to know about it. We also just remove that confusing "-o APT::Get::Trivial-Only=true" blob. It's unclear what it does from the outside. It was originally taken from the official upgrade procedure as a mechanism to show how much disk would be used by the upgrade, but the download steps we use already show that information anyways, so it's actually a duplicate.