If I try to install I got the same error message: "password or username 
It is clearly related to permissions.

I am able to install software from command line, for example:

    sudo snap install krita

using sudo!!!

Software Center (ubuntu-software) however does not run as root! So it is
not able to log in to my Ubuntu One account, so it is not able to
install snap packages.

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  Ubuntu Software asks for an Ubuntu Single Sign-On account to
  install/remove a snap

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