On Saturday 31 December 2016 17:56:59 Felmon Davis wrote:
> suppose I now install Trinity. should I let it write to the mbr or
> rather to its own partition?

I am confused, or you are confused, or we are both confused.

Trinity is a desktop environment, not an operating system.  The mbr doesn't 
come into it.  Install the relevant operating system, with or without a DE, 
then install Trinity from the Trinity repositories as you would any other 
software from your distros repositories.  Then it cannot muck up your other 
OS's.

It is, if you wish, possible to use one of the available Live CDs to install 
an OS with Trinity already installed, and the default DE, just as most Debian 
newbies install Debian with Gnome and most Ubuntu newbies install Ubuntu with 
Unity.  But you don't have to do so, and I never do.  I install Debian, and 
then add Trinity.

Lisi