I have followed the instructions at https://wiki.archlinux.org/index.php/Installation_guidewhen installing ArchLinux on an older computer.I have no wired connections available and the installation was done using Wifi. However when I try to start the wifi-menu after the installation I'm prompted about the Dialog package. Of course I can't install it without internet connection (I can't even use pacman -Sy).I reboot and use the CD. When I want to install the dialog package it says it's already installed. I install it anyway and when I reboot the computer has no idea what I'm on about when I try to launch wifi-menu; it asks for the Dialog package again - that needs to be downloaded.  How do you get out of this Catch21 situation?
ArchLinux: Wifi-Menu and installing Dialog
arch linux
Be sure that you've mounted your partition(s) and that you are arch-chrooting into the correct place. When you chroot in, does your filesystem look correct ? If you've installed along with (or similar to) the beginners guide your command will look something similar to arch-chroot /mnt /bin/bash though the second arg is just to set your shell.