Now I got my notebook back from repair and I finally have installed Solus!
On my first boot I realized, that the boot manager recognises one of my empty partitions as "unknown linux distribution".
I mounted the partition in the fstab to my home-directory and everything works fine.
After I copied some data on it, everything still works, but the system recognizes it as linux distribution.
Gparted shows it right, the file manager doesn´t show the partition in "Other locations".
The other partions sda5/sda7 are also mounted, but I also find them in "Other locations".
What´s wrong here? Is it possible to delete the entry in den boot manager?