As nmsuk says, you have got to a point where it cannot continue.
One thing which often works is tope the Troubleshoot (On the left in the "Update and Security page of the settings)
Select the troubleshoot update feature and let it run. AFter, if you look in the update section, you should find it has gone. You should then heck for updates and, if succesful, allow it to run again. when almost at the end, it will state it needs a restart to finish.
FWIW. It is not a good thing to attempt to disable the updates. Maybe I am lucky, but I have never had problems with them. The so-called features are mostly "under the hood" and will not disturb you in any way