Thanks, but it's more like welcome back
Damn I missed pacman :love: it's good to be back
I would suspect that your grub details were incorect in your install procedure.
Review the install guide that appears on the home page as regards your entries for grub.
Be certain you have identified the correct root partition for your install and the boot partition(automatic in the auto install).
Some info is available in the wiki for installing arch.
Welcome to arch!
]]>