Managed to fix it.
UUID was correct.
I had to add few stuff into mkinitcpio.conf
This was trial and error, so if anyone can tell me what stuff are not necessary (e.g. can be removed), I also read somwhere that because I’m using raid I should add something to shutdown/reboot script, but I don’t know what.
HOOKS=“base udev mdadm_udev lvm2 autodetect modconf block keyboard keymap mdadm
I had Ubuntu/Windows combo on my RAID 5 setup. RAID is probably Fake ( it’s provided by ASUS MBO). So I booted live cd to switch Ubuntu for Antergos, deleted Ubuntu partitions, created new ones and install went without problems, but on BOOT I’m getting message: Unable to find root device: UUID:…
I tried moving block in HOOKS of mkinitcpio.conf before autodetect but that didn’t work. Any suggestions?