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Download page: https://www.archlinux.org/download/ Installation Guide: https://wiki.archlinux.org/index.php/Installation_guide
Save the iso file and bootstrap files to a USB.
1# dmesg to find the /dev/sdx (for example my usb was /dev/sdb)
2# dd bs=4M if=/path/to/archlinux.iso of=/dev/sdx status=progress && sync
3# ping archlinux.org (to check for internet connection)
4# mkfs.ext4 /dev/sda1 to partition the root drive to sda1 with ext4 filesystem
5# pacstrap /mnt base (to install base packages)
6# genfstab -U /mnt » /mnt/etc/fstab
7# arch-chroot /mnt (change into root)
8# ln -s /usr/share/zoneinfo/Region/City /etc/localtime (/Region/City = /America/New_York)
9# hwclock –systohc
10# locale-gen (to generate the locales[stuff like keyboard layouts and date order and such])
11# hostnamectl set-hostname myhostname (make sure /etc/hostname exists[also go into /etc/hosts and add the hostname to the list])
12# passwd (to change root password)
13# grub-install –target=i386-pc /dev/sdx
14# grub-mkconfig -o /boot/grub/grub.cfg
15# exit
16# unmount /mnt
17# reboot
18# useradd -m -g initial_group -G additional_groups -s login_shell username
19# pacman -S plasma-meta (this downloads the KDE Plasma desktop environment)
to change root use: arch-chroot