Arduino Yun 'logread -f' Problem

Hi all,

I want to establish 3g connection for Arduino Yun with usb modem.

Here is my reference: http://selfbuilt.net/wiki/doku.php?id=arduino_yun_mobile_networks

When I tried to logread to examine usb id, I got these error from arduino yun.

root@linino:/# logread -f
Oct  3 11:04:31 linino user.info sysinit: handle umount errors 
Oct  3 11:04:31 linino user.info sysinit: check umount 
Oct  3 11:04:33 linino user.info sysinit: handle umount errors 
Oct  3 11:04:33 linino user.info sysinit: check umount 
Oct  3 11:04:35 linino user.info sysinit: handle umount errors 
Oct  3 11:04:35 linino user.info sysinit: check umount 
Oct  3 11:04:37 linino user.info sysinit: handle umount errors 
Oct  3 11:04:37 linino user.info sysinit: check umount 
Oct  3 11:04:39 linino user.info sysinit: handle umount errors 
Oct  3 11:04:39 linino user.info sysinit: check umount 
Oct  3 11:04:41 linino user.info sysinit: handle umount errors 
Oct  3 11:04:41 linino user.info sysinit: check umount 
Oct  3 11:04:43 linino user.info sysinit: handle umount errors 
Oct  3 11:04:43 linino user.info sysinit: check umount 
Oct  3 11:04:45 linino user.info sysinit: handle umount errors 
Oct  3 11:04:45 linino user.info sysinit: check umount 
Oct  3 11:04:47 linino user.info sysinit: handle umount errors 
Oct  3 11:04:47 linino user.info sysinit: check umount 
Oct  3 11:04:49 linino user.info sysinit: handle umount errors 
Oct  3 11:04:49 linino user.info sysinit: check umount 
Oct  3 11:04:51 linino user.info sysinit: handle umount errors 
Oct  3 11:04:51 linino user.info sysinit: check umount 
Oct  3 11:04:53 linino user.info sysinit: handle umount errors 
Oct  3 11:04:53 linino user.info sysinit: check umount 
Oct  3 11:04:55 linino user.info sysinit: handle umount errors 
Oct  3 11:04:55 linino user.info sysinit: check umount 
Oct  3 11:04:57 linino user.info sysinit: handle umount errors 
Oct  3 11:04:57 linino user.info sysinit: check umount 
Oct  3 11:04:59 linino user.info sysinit: handle umount errors 
Oct  3 11:04:59 linino user.info sysinit: check umount 
Oct  3 11:05:01 linino user.info sysinit: handle umount errors

Does anyone have any idea about my problem?

Thank you for any help, it would be greatly appreciated.