[Ubuntu Wiki] Update of "DebuggingUdev" by g2p

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The "DebuggingUdev" page has been changed by g2p:
http://wiki.ubuntu.com/DebuggingUdev?action=diff&rev1=11&rev2=12

Comment:
make initramfs instructions more clear

    * sudo pkill udevd
    * sudo udevd --debug-trace --verbose --suppress-syslog
   * To get more debug info from udev,
-   * edit /usr/share/initramfs-tools/scripts/init-top/udev, and change the line starting udev by adding --debug and sending stdout and stderr into a file called /dev/.udev.debug . For instance:
+   * edit /usr/share/initramfs-tools/scripts/init-top/udev, and change the line starting udev by adding --debug, removing --daemon (using & instead), and sending stdout and stderr into a file called /dev/.udev.debug . For instance:
  
      /sbin/udevd --debug --resolve-names=never > /dev/.udev.debug 2>&1 &
    * then run sudo update-initramfs -k all -u