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When booting with Fedora-Server-dvd-x86_64-30-20190411.n.0.iso, /proc/cmdline is empty (libvirt, qemu host with bios, not sure if that matters), after installation to disk, anaconda would "crash" in kernel-core %posttrans, after calling kernel-install, because dracut would fail with > Could not determine the kernel command line parameters. > Please specify the kernel command line in /etc/kernel/cmdline! I guess it's legitimate, even if unusual, to have no cmdline parameters. Two changes are done in this patch: 1. do not fail if the cmdline is empty. 2. if /usr/lib/kernel/cmdline or /etc/kernel/cmdline are present, but empty, ignore /proc/cmdline. If there's explicit configuration to have empty cmdline, don't ignore it. The same change was done in dracut: https://github.com/dracutdevs/dracut/pull/561.