Comment 26 for bug 507881

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up-whatever (up-whatever) wrote : Re: Lucid alpha 2 fails to start up unless you remove /proc/bus/usb from the fstab

I updated from Karmic to Lucid about 12 hours ago and searching the cause for Lucid not booting took a lot of time.
It turned out the problem was this very "usbfs" which I put into fstab to get USB working in VirtualBox. And unlike the description of this bug there was no error message hinting to USB; last thing i saw in recovery-mode was how my ext3 filesystems got mounted and then the booting process just stopped.

I'm pretty sure a large percentage of VirtualBox users edited fstab the same way and all these users will be left with a black screen after trying to boot their updated system, which might even cause some of them to do a complete reinstall of their system.
I suggest that /etc/fstab is parsed during the update process and any lines containing "usbfs" as filesystem should be commented out.