Mathematica 10.3.1 on Linux Installation Error

When I install Mathematica 10.3.1 on Linux, I get a InstallError file with the content:

“xdg-icon-resource: No writable system icon directory found.”

repeated 33 times.

After the installation, I can execute mathematica in command line, but some times is get 40 seconds to open it, and some times open instantly. I don’t know if there is some relation to InstallError file.

I’m using a Ubuntu with there configurations: No LSB modules are available. // Distributor ID: Ubuntu // Description: Ubuntu 14.04.3 LTS // Release: 14.04 // Codename: trusty

Any clue?