I am trying to install on a ancrypted partition and I get similar error (wrong device number for root partition), but the device numbers are the other way round - /dev/root points to major 253 while the real device (crypt_sda2) is major 254.
This is actually the second time I try to install this way and previously it failed somewhat differently. I don't remember the exact details, but I think this is a progress :) -- Ecce Jezuch "Arise as did the gods Ninti and Ishkur, Ishkur!" - S. Tankian
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