archiso is not packaged for aarch64 in ALARM repos — install from the upstream GitLab source with PREFIX=/usr so mkarchiso lands in /usr/bin. Also: - Set mirrorlist explicitly (ALARM tarball ships with a stale/empty one) - Add archiso runtime deps: mtools, dosfstools, libisoburn, squashfs-tools, arch-install-scripts, e2fsprogs Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>