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I had used 'make localmodconfig' for testing purposes and forgot about it. So on the second system missing USB-drivers prevented /root/ from being mounted. Copying a more general-purpose configuration to .config resolved the problem. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iEYEARECAAYFAlRaCH4ACgkQ5+rBHyUt5wu1nACfZa5wBhvHdVl543QKDZNxJJaj HWIAoLuSmuF3+lC7Vy72IolI9TLRA+0d =Irbg -----END PGP SIGNATURE-----