I am getting Ubuntu base update almost every day. This seems strange to me. What am I missing?
(I am using Ubuntu 14.04 LTS)
Ubuntu base is a group for the tools and services and core parts of Ubuntu and the following applies equally to any software installed.
It's normal to have Ubuntu base updates more often. In Linux, security flaws are found much easier when they exist due to the code being open. Then the patch is immediately put upstream and onto your computer through the package update.
Whereas in a closed source system, often such flaws aren't found until exploitation. Its just a matter of when the security flaw is found, not the existence itself.
Like the other answers say, this seems normal. If the frequent update reminders bothers you, you can set up automatic security updates.
If it gets annoying you could change Security Updates in your update setting to how long you want. After that time it would show you if a new update has come.