@kugiigi already added in the bug report 6 minutes before your last post

Hello @kugiigi, yes you understand correctly. I guess UT tweak tool just calls

android-gadget-service enable rndis

because I have tried it and I see the same behaviour. After that you have to call

sudo tethering enable

and it should work. Remember to do both, not just the second one, and it is necessary each time you switch to MTP.

If someone here is interested, the solution is there.

@advocatux ok, thank you, I'll have a look in that. For now I think it's enough today

Just to summarize:

• no need any OS modification
• no need developer mode enabled
• just run on phone terminal:

android-gadget-service enable rndis
sudo tethering enable

ps Would it be difficult to integrate this with the network menu? It's a pretty common feature to require.

@advocatux ok, I think we are done. In the previous OS version I had on my phone

android-gadget-service enable rndis

was enough. Reading the guide you posted I found out there is a

sudo tethering enable

to be executed. I tried and now this post is flowing through my BQ E4.5
Now I have just two more questions: before to see the command I had already enabled RW permissions on my device. Is there a way to go back to RO without reinstalling the OS or is it impossible as described here? Should I be scared of having a RW OS or is it ok?
Thank you for the support up to here.

Ok, for completeness I've tried another cable and I'm experiencing the same issue. Moreover, both of them work fine for MTP.

No question is stupid when debugging
I haven't tried (I will) but the one I'm using is the same I used to install UBports UT, and I had no problem.

Hello, this story begins here, but I will go to summarize it shortly.
Setting:
device BQ Aquaris E4.5
OS UBports Ubuntu 16.04 (OTA-7)

After the upgrade from the last Canonical Ubuntu Touch release to UBports Ubuntu 16.04 (OTA-7) I'm not able anymore to activate USB tethering and use my phone as a USB modem. If I run

android-gadget-service enable rndis

it correctly returns

rndis enabled

and my computer (Ubuntu 16.04 LTS) starts trying to connect to the cabled network, but it actually never gets an IP address (despite an enp0s29u1u3 interface appears). From phone terminal there is no visible interface about this connection. Wi-Fi hotspot works fine.
I don't have another computer to try, but I will try at least with another OS.
Let me know what else can be useful to debug this problem.

@advocatux I've no knowledge to answer, I don't know which are the requisites to run android services (but it would be very useful at this stage for Ubuntu Touch appealing to have access to the full play store for all the devices, while the community works to create native applications).

@ziggutas be sure you don't have other active connections than USB connection with your phone (ethernet cable, wifi, other USB modem...), otherwise hostname command may return informations about that.
@Lakotaubp I agree, I'm going to create a new thread

I think Anbox project is a great idea and I also would like to contribute, but I have only a BQ Aquaris E4.5. Will Anbox be supported also on this device in the future or will it be limited to the currently supported devices?

Thank you @advocatux, I've tried to follow that guide:

• enabled developer mode
• enabled rndis (with explicit notification on the terminal)
• connected USB cable

The problem is that the computer doesn't get an IP from my phone, so I'm stuck at step 2 of the guide. Moreover, I don't remember if it should, but running ifconfig on the E4.5 terminal there is no interface that seems to deal with rndis and usb connection. Can someone with the same device check if it is possible to enable USB tethering and, if it works, check if enabling rndis makes it appear a new interface? (Check also if it is visible before to connect it to the computer).
Anyway, if we don't solve in a couple of posts I think I will create a dedicated topic, because we are very OT.

@guru no, I didn't use it, but I will take a look in that when Dekko2 will be ready
About USB tethering? No one has quick advice to make it work?

@Lakotaubp ok, I'll wait here someone who knows something about this

@Lakotaubp I've tried both with developer mode on and off, but the behaviour is the same. Anyway with the old version it worked with developer mode disabled. Let me know if I've to create a new topic. And thank you for the welcome

Done!!! I'm on board from about 45 minutes. Don't worry about the apps. Because the last version by Canonical was few steps away from beta release, I actually used it just for calls, SMSs and as an access point.
Now the bad news: I can't connect in USB tethering mode. With the previous version I could run

$android-gadget-service enable rndis

and the phone appeared in my desktop Ubuntu as an ethernet cable connection. Now the command does something, my computer starts trying to connect but actually never connects (it seems as if the computer didn't find an active DHCP assigning an IP to it). Is this a known problem someone can give a quick answer here or do I begin a new topic? In the second case which is the right category for this kind of issues?

Ok, you all have convinced me
Copied my home with a mere cp -r /home/phablet <microSD card>, removed the microSD card and checked I can read my SMS and call events data (found they are in /home/phablet/.local/share/history-service/history.sqlite which can be read with https://sqlitebrowser.org if someone arriving here needs it).
I'm ready to start, just the time for reading https://docs.ubports.com/en/latest/userguide/install.html

Ok, thank you for the links and for the answers.
It seems clear: NO WIPE, WIPE == DAMAGE Why that option is out there? (I'm joking, I suppose it is to be used for something else)

or if everything goes well my data is supposed to stay where it is after the upgrade?

Thank you all, you make me really feel at home
Yes, I know is not a good idea staying without updates, but up to one week ago I didn't know about UBports
Just some additional questions before this big step:

• ok, I'm sure I will not desire to go back, but if I do will it be possibile? Is my current ROM stored somewhere around the internet?
• is there a tool or a guide to backup my data (sms, call register, browser tabs and visited websites, photos...) and have them back after UBports upgrade?

ps @Lakotaubp perhaps my English is not so good, but I didn't understand your ps What did you mean?