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I'm trying to install steam, but the installer window is too small (see https://www.dropbox.com/s/qejkqz9fb2mf1so/schermata1.png?dl=0) and it's impossible to do anything.

I'm running kubuntu 15.04 x64

Is  there anyone who knows a solution?

Edited by abcdeeeeff

Try enabling the Virtual Desktop in Wine Configuration.
I have never seen that problem before in the installation.  Normally after Steam is installed, it updates its-self then goes to a login screen, but the fonts will be missing.