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On 29/09/12 02:42, Peter Teoh wrote:

I entered "lsusb" at the command line (as root) and nothing is return, not even any error message.

Doing a strace the last few lines are:

open("/dev/bus/usb", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = -1 ENOENT (No such file or directory) open("/proc/bus/usb", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = -1 ENOENT (No such file
or directory)

What happened?

This is Ubuntu 10.04 (it used NOT to be like that, not sure I what did wrong last time).

Ubuntu 10.04 Lucid uses kernel version 2.6.32. This was the first kernel version used in Ubuntu
that uses devtmpfs for /dev/.

$ grep DEVTMPFS /boot/config-2.6.32-37-generic
CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y

Your system appears to be missing the /dev/ structures created by the kernel in devtmpfs. Check that the kernel version is 2.6.32 or later.

$ uname -a

See: http://lwn.net/Articles/345480/




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