I built a file server out of old server equipment and decided to put zentyal on it but when I try to install zentyal it just shows the error "/dev/mapper failed this is a fatal error" when I get to the part to install grub. I have tried many things like creating a separate partition and setting it as reserved bios boot area but nothing has worked. The board uses Nvidia Mediashield Raid and I cannot (I think) create separate partitions on the disks for grub. Also I have 6 1tb HDDs and they are setup in raid 5.
Does anyone know how to fix this?
(The motherboard is an old Asus m2n-lr from 2005 with an Opteron 1210 CPU and 4gb ram)