As with any other progress window, the window should have a minimize button but no maximize or close button, and should be 33 em wide.
If you stop the check, the progress window should morph into an info alert with the title “Software Updater” and primary text “You stopped the check for updates.”.
If a check shows that updates are available, a “Software Updater” alert should appear.
(Like any progress window before it, it should be 33 em wide.) If the check was automatic, the alert should open non-minimized but unfocused.
Collapsing it should return the alert to its previous size.
The Updates Available window should be manually resizable only when it is in this expanded state.
If “Automatically check for updates” is checked, Ubuntu should become due to check for updates at the specified interval after updates were last checked.
Once it is due to check for updates, it should try to check one minute after the first time any administrator connects to the Internet (bug 323108, bug 414202).
By default, it should not display any interface while checking.
When checking interactively, Software Updater should display only a progress window.
) updates has been implemented in Ubuntu Software Center, those particular updates should no longer cause the alert listing updates to appear.
They should still be shown in the alert when it appears for any other reason, but they should not be checked (and should therefore not be installed) by default.
The state of the checkbox should reflect and change the state of the update checkboxes in that section: ☑ checked if they all are, ☐ unchecked if none of them are, and ⊟ indeterminate otherwise.