There are update and bug fixes from Canonical almost daily except perhaps
on weekends and major holidays. If you have had your system running for
more than a few days without any updates then something is not working as
it should.

You connect wirelessly, which normally can do the job. Is plugging in a
network cable an option? I would certainly try that if possible. Is the
Wifi hotspot your own router? If it is not you may have encountered a setup
that doesn't allow downloading data - unusual but possible.