I cannot reproduce this issue with 16.04.0, 16.04.3 and bionic. When "Download updates" is checked, updates are downloaded in /target/var/cache/apt/archives and available for installation after a reboot.
I'm closing this report, don't hesitate to reopen it if it is still an issue for you. ** Changed in: ubiquity (Ubuntu) Status: Confirmed => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1580232 Title: "Download updates while installing" does not download updates To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1580232/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs