So downloaded Kodi 17 Beta, fresh, noticed a few addons not updated so I clicked update, the majority of them said Failed to Update, and a couple said Failed to Install a Dependency.
I then went to try install a skin and got the same issue.
I then tried the nightly build, but had the same issue. I know it is early days for Kodi 17 and I know it is not stable, so thought I would try and be helpful and supply a log