Could be. My laptop is fairly new and none of the latest updates installed properly, even before 1803. The last two I had to install manually. Then when 1803 rolled out, it wouldn’t install. After many tries, I gave it one more shot and let it do it’s thing on it’s own. In the morning it was installed. The only problem I had was a graphics issue, which with some research, I got a graphics reset code and all has been well.
I have a friend who was on the phone with tech support for her computer and with microsoft. It took them nearly 8 hours to get hers working properly.
It’s weird how 1803 seems to be so problematic for so many. I hope it works out for you.