Ano - ale asi ne pro dualboot s Ubuntu. Neboť já tam našel akorát tuten nesmysl:
Arch not found from other OS
Some have reported that other distributions have trouble finding Arch Linux automatically with os-prober. If this problem arises, it has been reported that detection can be improved with the presence of /etc/lsb-release. This file and updating tool is available with the package lsb-release in the official repositories.
Funguje mi Ubuntu, ne Arch Linux - tak jsem asi vážně hloupý, když to řeším z toho fungujícího OS...
(Navíc bych potřeboval alespoň to manuální ovládání...)