I installed Magento 2 on Ubuntu 14.04, and tried to examine whether anything I need to update in Magento system.
I enter "Web Setup Wizard" from admin panel, but it shows the error message at the first step.
"Sorry, we can't take that action right now."
I have tried to find the solution in the official document, but nothing is found.
Best Answer
Just had the same problem with my install. Resolved it by entering the Public / Private Access Keys (in the Web Setup Wizard's System Config, 'Magento Marketplace').
You can get these when you log into your account on magento.com - Click on 'Connect' tab at top, then click on 'Developers' button to reveal 'Secure Keys' link. Click on it to manage / create keys.