Problem solved with a full reinstall.
Thanks for helping me.
mod_rewrite was installed but the problem still remains.
@creiss I just have 2 lines in error.log
AH00163: Apache/2.4.18 (Ubuntu) configured -- resuming normal operations
AH00094: Command line: '/usr/sbin/apache2'
I don't have installed the Apache Module mod_rewrite, could it be related??
I´m trying the i-doit 1.11.1 OPEN installed in Ubuntu 16.04 LTS, everything is OK, but when I try to use the Object Browser there's only the message Loading, pleas wait...
I can't find the origin of this issue, please help me!!