/proc/bus/usb/devices

And, it’s default path if you are on kernel 2.6.31 and usbfs is mounted by Init. Now, Ubuntu 9.10 is using upstart instead of init. It was working fine in Ubuntu 9.04. So it brought me in big world of usbfs. From Scott’s post usbfs: deprecate and hide option for !embedded. usbfs was enabled #417748 and disabled#488274 in Karmic Koala Released and Proposed version.

Ok, Ping back to original query, Ubuntu 9.10 is mounting debugfs instead of usbfs, regardless of  usbfs in enabled / disabled in Kernel. So you will fine usb/devices file under /sys/kernel/debug directory, check below output:

person@CANONICAL-DESK:/proc/bus$ mount
/dev/sda6 on / type ext4 (rw,errors=remount-ro)
proc on /proc type proc (rw)
none on /sys type sysfs (rw,noexec,nosuid,nodev)
none on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)

….

person@CANONICAL-DESK:/proc/bus$person@CANONICAL-DESK:/proc/bus$

person@CANONICAL-DESK:/proc/bus$ uname -a
Linux CANONICAL-DESK 2.6.31-20-generic #57-Ubuntu SMP Mon Feb 8 09:05:19 UTC 2010 i686 GNU/Linux
person@CANONICAL-DESK:/proc/bus$ cat /sys/kernel/debug/usb/devices

…

T:  Bus=03 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#=  2 Spd=12  MxCh= 0
D:  Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=046d ProdID=0a12 Rev= 1.00
S:  Manufacturer=Logitech
S:  Product=Logitech Wireless Headset
C:* #Ifs= 4 Cfg#= 1 Atr=80 MxPwr=100mA
I:* If#= 0 Alt= 0 #EPs= 0 Cls=01(audio) Sub=01 Prot=00 Driver=snd-usb-audio
I:* If#= 1 Alt= 0 #EPs= 0 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
I:  If#= 1 Alt= 1 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
E:  Ad=01(O) Atr=09(Isoc) MxPS= 288 Ivl=1ms
I:* If#= 2 Alt= 0 #EPs= 0 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
I:  If#= 2 Alt= 1 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
E:  Ad=82(I) Atr=05(Isoc) MxPS=  32 Ivl=1ms
I:* If#= 3 Alt= 0 #EPs= 1 Cls=03(HID  ) Sub=00 Prot=00 Driver=usbhid
E:  Ad=83(I) Atr=03(Int.) MxPS=   8 Ivl=10ms

…
person@CANONICAL-DESK:/proc/bus$

Currently i am testing this on Ubuntu 10.04 (Lucid Lynx) Alpha 3, and behavior is almost same. But it contains  new version of usbutils, which has new shell script called “usb-devices”. It will give you connected USB buses with machine, regardless of where your usb/devices file is! and output is almost same. check below output

hardik@hardik-desktop:~$ uname -a
Linux hardik-desktop 2.6.32-16-generic-pae #25-Ubuntu SMP Tue Mar 9 18:03:39 UTC 2010 i686 GNU/Linux
hardik@hardik-desktop:~$ usb-devices

…

T:  Bus=01 Lev=02 Prnt=02 Port=04 Cnt=01 Dev#=  3 Spd=12  MxCh= 0
D:  Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
P:  Vendor=046d ProdID=c52e Rev=15.00
S:  Manufacturer=Logitech
S:  Product=USB Receiver
C:  #Ifs= 2 Cfg#= 1 Atr=a0 MxPwr=98mA
I:  If#= 0 Alt= 0 #EPs= 1 Cls=03(HID  ) Sub=01 Prot=01 Driver=usbhid
I:  If#= 1 Alt= 0 #EPs= 1 Cls=03(HID  ) Sub=01 Prot=02 Driver=usbhid

…

This question  was asked by my  friend Mr.  Sunil and  it turns in to  blog . That’s it for now…

Here is my statics during Ubuntu 9.10 To Ubuntu 10.04 LTS (RC Release) upgrade process.

I started upgrade early in the morning in IST time zone with 8 MBPS Broadband Line. I was already running Ubutnu 9.10 with latest updates. During upgrade process, 1574 package was upgraded, 242 was new and 27 packages was removed. It took 45 minutes to download 1064 MB of data. Total upgrade time from Start to Reboot was around 3 hours on my Intel Dual Core machine with 4 GB Ram, i did Bath, Breakfast and checkout during this time. Last upgrade was of Ubuntu 9.04 under 40 Degree Celsius temperature @ Ahmedabad, this time i was in BLR with 20 degree Celsius temperature, Actually my laptop has heat problem, so this parameter was concerned for me.

Here is step to upgrade Ubuntu 9.10 to Ubuntu 10.04

Note: I would advise to take the backup from your existing system to be at safer side. Also, please make sure that you machine is connected with uninterrupted Internet to make upgrade smoother.

Step – 1:

Make sure that your current Ubuntu 9.10 installation is up-to-date with latest updates. If not please update it with latest updates.

Launch update-manager

Update Manager

Step – 2:

If “Your system is up-to-date” then you can start the Ubuntu 10.04 LTS upgrade process.

Launch Ubuntu 9.10 Upgrade Manager

Ubuntu 9.10 Update Manager with Ubuntu 10.04 LTS upgrade option

Step – 3:

Press the “Upgrade” button in Ubuntu 9.10 Update Manager with Ubuntu 10.04 LTS upgrade option window. it will start the upgrade option with release note. it’s still in BETA stage, so please read it before you proceed ahead and make sure it’s not affect your upgrade process. if you are not sure what you are doing please press “Cancel” button to cancel the upgrade process or else “Upgrade”

Ubuntu 10.04 BETA Release Note

Step – 4:

After going through Ubuntu 10.04 release note (Beta). It’s total six stage process. From Preparing Upgrade to Restarting the Computer. It will download the Update Manager Core.

Upgradation of Update Manage Core

Distribution Upgrade

Setting Up New Software Channels

Notification: Support For Some Application Ended

Notification: Do you want to start upgrade?

Getting new packages

Installing the upgrades

Cleaning up

Remove Obsolete packages

Restart the system to complete the upgrade.

After successful reboot, you will notice purple Ubuntu Boot Splash. If everything goes fine it should boot perfect, which happened in my case, you may have to change themes  and your existing desktop to give complete Ubuntu 10.04 LTS look.

I have also noticed 100% CPU utilization during “Cleaning Up” stage.

100% CPU Utilization during Cleaning Up stage

I hope this will also help for smooth upgrade from Ubuntu 9.10 to Ubuntu 10.04 LTS (RC Release).

Have Happy Upgrade….