I got a live CD and I tried to install it manually because it doesn't support installing.
So I booted from live cd and did:
mkfs.ext4 /dev/sda5 mount /dev/sda5 /mnt cd /mnt unsqaushfs /cdrom/casper/filesystem.squashfs mv squashfs-root/* ./ rm -r squashfs-root mount --bind /dev /mnt/dev mount --bind /sys /mnt/sys mount --bind /proc /mnt/proc chroot /mnt grub-install /dev/sda update-grub
So I restarted and it said that it can't mount the filesystem.
So I tried the same with ext2 because in the grub config stood
insmod=ext2 and when I tried to boot with
insmod=ext4 it said file not found.
But still even with ext2 it said that it can't mount the filesystem.