If one deselects all packages, the "Install Now" button disappears, which makes sense (on another note it would make even more sense if it was simply grayed out). However when one or more packages are then re-selected, the button won't ever reappear, and update-manager must be restarted in order to upgrade any packages.
If one deselects all packages, the "Install Now" button disappears, which makes sense (on another note it would make even more sense if it was simply grayed out). However when one or more packages are then re-selected, the button won't ever reappear, and update-manager must be restarted in order to upgrade any packages.
update-manager 1:24.04.6 (Ubuntu 20.04)