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The username regex accepted names that already exist on the target, so useradd failed inside arch_install_system — after the disk had been partitioned and formatted, which is the worst point to discover it. From #59 by @wolfgangw, applied to quattro; it was opened against main. Co-Authored-By: Wolfgang Woehl <tito@online.de> Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>