Ive ran recently in to an issue where i couldnt perform an update from the admin UI, in order to get up and running i executed the following from a ssh shell. I was luky enough to find the documentation here
/usr/lib/applmgmt/support/scripts/software-packages.py install --url
Some of the additional options that could be used
software-packages stage --url software-packages install --staged
I like to perform the update from the command line because it gives me additional information that i might not be able to see in the UI
Typically the patching requires a reboot and the installation can be completed by executing the following:
shutdown reboot -r "patch reboot"