When I SSH into my Ubuntu Desktop, I get some output saying:0 packages can be updated.0 updates are security updates.However, running sudo apt-get upgrade tells me that a package (numix-icon-theme) can be upgraded. Is there a reason that I'm told there are no updates?
Logging into my desktop from SSH says I have no updates, but I do
ssh;apt;upgrade
The reason is either:there's a bug in the ~/.profile or /etc/profile (or wherever) code which detects and counts the available updated packages.apt-get update hasn't been run recently (i.e. since the updated package was made available).  There's probably a cron job that runs apt-get update periodically.  If it's important to you, modify the crontab entry so that it runs more frequently.