[ubuntu] Can't boot / mountall main process terminated with status 127

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http://ubuntuforums.org – I don't recall the last time I rebooted this machine, but it wasn't long ago and I don't think I made any many changes to it since then. I do recall doing an apt-get upgrade and seeing something about ureadahead requiring a reboot, so I rebooted, and now the system doesn't boot up. In normal mode, sometimes grub goes directly to a black screen, once in a blue moon it boots, but usually it hangs on boot. In recovery mode, sometimes it hangs on boot with the same error that normal mode gives, but normally it boots. If I resume boot from recovery mode, it works fine. fsck found a bunch of delet (Hardware)