Best web content management system for unsophisticated end-users?

[Thomas Cameron]

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I am trying to help a buddy set up a simple web site for a small
landscaping business. I'm going to run it on a Fedora 21 VM on Digital
Ocean (I love them, by the way).

I will set up the OS and software, and I'm a relatively savvy
sysadmin, but he's not an IT guy at all. I'd like to make sure it's
dead-bang easy for him to upload pictures and the like when his
company finishes a new project.

Does anyone have a favorite CMS that is really easy for users?

Many thanks!
Thomas
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