How to install Linux on root partition?

Question

linux

I'm doing a task. They said to install centos 6.6, do the installation itself on the root partition (namely on the root partition !!!) Does it turn out not to create /boot? After creating / partition, I click the checkbox "Force to be primary partition", then the /home, /usr, /opt, /var partitions go. After creating, I click install and the error comes out "Unable to read group information from repositories. This is a problem with the generation of your install tree" . But if I add the /boot partition, everything is fine. Please explain how to do the installation correctly, I did it according to the manual, but it's useless

Answer 1

exactly on the root section
Either the one who issued such a "task" was mistaken, or you misunderstood him. The root partition (/) can not exist . From the word at all. For a test installation, it is generally enough for the installer to let him partition the disk as he pleases. If, according to the conditions, manual breakdown, then in simple cases they make /boot, root and swap, in more difficult cases they separate /home, in even more complex ones - /usr, /var and /tmp.
Download another distribution from another mirror, check the checksum - it is always published on centos mirrors.

Answer 2

It seems to me that it's not the /boot partition. What exactly does it mean

it is on the root section !!!

? The system is in any case put on the root section. Even if you mount all existing partitions in the installer, including /boot.
Just make two partitions - root and swap. All. Exactly the same condition, why additional sections? Force to be primary partition is not required to be pressed by condition.
It seems to me that the matter is either in the absence of the Internet during installation, or a broken distribution.