# MangoH USB Ethernet Adapter Issue on Ubuntu

**URL:** <https://forum.legato.io/t/mangoh-usb-ethernet-adapter-issue-on-ubuntu/2972>\
**Category:** Legato Linux distribution (Yocto project)\
**Created:** [January 19, 2018, 7:32am UTC](https://forum.legato.io/t/mangoh-usb-ethernet-adapter-issue-on-ubuntu/2972 "2018-01-19T07:32:41Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![yogesh.tyagi](https://avatars.discourse-cdn.com/v4/letter/y/c89c15/32.png) [@yogesh.tyagi](https://forum.legato.io/u/yogesh.tyagi)\
**Post date:** [January 19, 2018, 7:32am UTC](https://forum.legato.io/t/mangoh-usb-ethernet-adapter-issue-on-ubuntu/2972/1 "2018-01-19T07:32:41Z")

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Hi,

I am using MangoH green board. When I flash Legato version 17.08.1 on this board (Available here : [https://source.sierrawireless.com/resources/airprime/software/wp76xx/wp76xx-firmware-release-6/](https://source.sierrawireless.com/resources/airprime/software/wp76xx/wp76xx-firmware-release-6/)) USB Ethernet adapter is not enumerated on Ubuntu but if I flash Legato version \> 17.08.1, USB Ethernet adapter is created in Ubuntu machine. I need to use Legato version 17.08.1 only due to some application dependencies. Can somebody provide some clues about this issue?

Thanks,  
Yogesh

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**Author:** ![lotam](https://avatars.discourse-cdn.com/v4/letter/l/958977/32.png) [@lotam](https://forum.legato.io/u/lotam)\
**Post date:** [January 19, 2018, 8:36am UTC](https://forum.legato.io/t/mangoh-usb-ethernet-adapter-issue-on-ubuntu/2972/2 "2018-01-19T08:36:37Z")

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Hi Yogesh,  
I don’t have WP76 to test but refer to customer release note ([https://source.sierrawireless.com/resources/airprime/software/release\_notes/wp76xx-release-6,-d-,1-customer-release-notes/](https://source.sierrawireless.com/resources/airprime/software/release_notes/wp76xx-release-6,-d-,1-customer-release-notes/)), section 5.2, there is one change in Release 6.1 related to USB ECM:

> Fixed an issue in ECM gadget where ECM  
> MAC address on the host doesn’t match the  
> WP for linux kernel 4.4.x hosts (e.g. Ubuntu  
> 14.04 / 16.04)

Any chance you are using Linux host with kernel 4.4.x mentioned?  
If yes, can you try Linux host with older kernel version so you may able to keep using Release 6?

Hope it helps.  
Thx

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**Author:** ![yogesh.tyagi](https://avatars.discourse-cdn.com/v4/letter/y/c89c15/32.png) [@yogesh.tyagi](https://forum.legato.io/u/yogesh.tyagi)\
**Post date:** [January 19, 2018, 9:49am UTC](https://forum.legato.io/t/mangoh-usb-ethernet-adapter-issue-on-ubuntu/2972/3 "2018-01-19T09:49:16Z")

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Hi Lotam,

My Linux host kernel version is “4.2.0-27”. Please take a look at the “uname -a” command output below:

```
# uname -a
# Linux ubuntu 4.2.0-27-generic #32~14.04.1-Ubuntu SMP Fri Jan 22 15:32:26 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

```

Do you think anything else may be causing this issue?

Is there any other way to connect “Developer Sutdio” to WP76 if my linux host in not creating USB Ethernet adapter?

Thanks,  
Yogesh

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**Author:** ![lotam](https://avatars.discourse-cdn.com/v4/letter/l/958977/32.png) [@lotam](https://forum.legato.io/u/lotam)\
**Post date:** [January 22, 2018, 2:09am UTC](https://forum.legato.io/t/mangoh-usb-ethernet-adapter-issue-on-ubuntu/2972/4 "2018-01-22T02:09:02Z")

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Hi Yogesh,  
The RJ45 ethernet adaptor should works so you can connect it to the your router so PC with Developer Studio on same network should able to talk to it.

If USB ECM is desired, I would try older Ubuntu, i.e. 14.xx, to see does USB ECM works.  
Hope it helps.  
Thx