I resolved the problem I had problems in /etc/apt/source.list
In the install tutorial put the sources because on the install don't specify them....
Re ;
The documentation don't talk about repositories because it's assumed that you are installing i-MSCP on a Debian/Ubuntu base install, which normally, contains the needed repositories. The i-MSCP installer is able to add the missing sections in your sources.list file as long you have the default repositories.
Anyway, any administrator that use i-MSCP should know a minimum about its distribution and the involved services (Mail, DNS, Http...). We are not here to teach you about your distribution and more commonly, about LINUX.
Thank you for using i-MSCP.