DirtyAngel Seems then that attacker at me tries MITM attack and has system with uefi, while I have system with grub2. This way downloads from my side ends up with malformed grub2
Look, this has nothing to do with any sort of "attacker". Either something is wrong with the installer, or you set up the partitions the wrong way.
Did you let the installer overwrite the whole disk, or did you manually set something up? Is there a second OS on the disk? I'm not entirely sure what's the boot_grub partition you mention. Did you manually create that? Seeing as you also mention a /home partition, it seems like you did manual partitioning, since AFAIK the Solus installer doesn't create a separate partition like that.
Wenn booting harddisk then appears "grub" with blinking cursor.
What do you mean by that? Does the screen say "grub", plus a blinking cursor? Or is it just the blinking cursor? In the latter case, what makes you think that it's grub you're seeing, and not some other part of the boot process?
