Quando tento instalar o vapor no Ubuntu software center , recebo este erro:
This error could be caused by required additional software packages which are missing or not installable. Furthermore there could be a conflict between software packages which are not allowed to be installed at the same time.
Na verdade, eu só encontrei isso, você já instalou o Steam do PPA? Se você removeu o PPA (abra a guia Software Sources, Other Source, e remova as fontes de vapor) e desinstale o steam (abra um terminal [ctrl + t] e digite "sudo apt-get remove steam" sem as aspas)