By the way, if I first *mount* the partition on which Arch is located, update-grub finds the installation. After I mount /dev/sda5 (the / partition for Arch), the output of 'sudo os-prober' is:
/dev/sda1:Windows 7 (loader):Windows:chain /dev/sda5::Arch:linux
By the way, if I first *mount* the partition on which Arch is located, update-grub finds the installation. After I mount /dev/sda5 (the / partition for Arch), the output of 'sudo os-prober' is:
/dev/sda1:Windows 7 (loader) :Windows: chain :Arch:linux
/dev/sda5: