I can see from the launcher that the Update Manager is running – it has the little triangle by it. However, I am having trouble seeing the window. If I click on it from one desktop, it switches to another, so I assume that the Update Manager has its window on that other desktop, but it still doesn't show anything.
If I click alt-tab to switch between apps, I can see that the Update Manager is there, but selecting it just shows me a blank screen. Also, when I select it, while still holding the alt-key, I see the top menu bar switch to 'Update Manager', but when I release alt, it changes back to Ubuntu Desktop.
It's almost like the app is off the screen somewhere, perhaps with just a single pixel showing or something like that.
disclaimer: One thing that might be affecting things is that I have 'focus follows mouse' configured, which makes things a bit funky with the menu not being on the window, where it should be (perhaps there's a way to put it back with the window?) – I like to be able to type into background windows, and manually control which window is in the foreground.
Best Answer
I am having the same issue with not being able to open / view the window using the Update Manager icon in the right side launcher.
Workaround: right-click the icon and Quit Update Manager from the quick list, then go to the top right Settings (gear) menu and click on Updates Available...
This would show the Update manager window.