As Artur said, posting answer that don't use the command line is absolutely fine. However, your post wasn't actually an answer. After your edit which removed the suggestion of the already existing feature of unattended upgrades, this is the entirety of your answer:
I have had the same problem. I was able to do the updates through Synaptic Package manager.
OK. So what is this tool? How does one get it? What do you need to do with it to get around the problem? How do you use it?
We expect answers to have more detail here and explain what needs to be done. The question doesn't actually ask a specific question, which is unfortunate, but a perfect answer would explain what this "prepared update" thing is, what causes it, how to avoid it in the future, and how to get around it. Your answer only suggests that using some tool in some unspecified way might be able to do some undefined improvement.
I know it seems like we're all a bunch of nitpicking pedants. And, frankly, many of us are. I certainly am! But the goal of thee sites is to provide a useful library of questions and answers to help future visitors. This is why we're so persnickety about "quality" and rules. It seems weird at first, the simple truth is that these rules, and this pedantry, result in a useful resource and are what stops us from becoming the noisy mess of the classic forums.