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@keneda no
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@audrew either you don't have the correct/latest or no ADB driver installed, or your usb cable is faulty. Also try another usb slot on the pc, preferably not usb 3.
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@mrt10001 I did correct installation on nexus 4 with same usb. I just also tried another usb even though one is working too. nothing changed
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@audrew
Here what i can tell you, but i did install on my mx4 using windows 7 so it surely differs from ubuntu.I asked you for the recovery thing because my mx4 ubports installer install always issued the same exact moment each time i tried, untill i understand that on windows, my device was 3 separate devices in device manager for every boot mode, one device was normal boot, for wich i had to install (or link) adb drivers so that ubp installer auto detect device, one another device was when i connected my mx4 in fastboot, another adb driver link needed here to allow installer to reconnect to device after rebooting it from normal to fastboot, and at least, one last adb driver link when booted in recovery, so that ubp installer can continue to "talk" to device after rebooting it from fastboot to recovery, and finish install.
So best is to boot device in normal, link adb driver, then reboot fastboot, link adb driver again, and then reboot recovery, and do the last adb link, and then you can reboot in normal, launch ubp installer, and plug usb then device recognised and install is auto from beginning to end.
Again, that was under windows, with a mx4, and i have no clue how unbutu or linux desktop handle drivers install and link to devices, so maybe your issue is not the same or same origin, but, my two cents here ^^
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@keneda I tried to find manual to install it via twrp, I get official system.img boot.img of ubuntu touch. But probably not all files was correct and it doesn't boot. Maybe anyone know any article about that?
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@mrt10001 out artifacts link is broken
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@audrew It's an old post, but should give pointers. Don't take it "as is", but use it to help solve issues.
If you have an ADB error, you have to do basic troubleshooting i.e.:
Change USB cable
Change USB port
Try another PC
Update ADB drivers
Clear space on your PC
Install TWRP and format data partition and make sure it is formatted to EXT4
Wipe the system and Cache partition
Reinstall the correct stock ROM, but DO NOT relock the bootloader (you have to use a windows PC for Xiaomi phones and use the Mi Flash tool) and start again.One USB cable may work on one device, but not on another.
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@mrt10001 as far as I know adb shoudnt to be detected in fast boot mode. Or it should? Every time I try to install ubuntu, boot data is erased and the ubuntu touch is not installed. So basically I have to rewrite back android and try again. It is very tedious
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@audrew ADB is like a higher level of Fastboot. Basically ( please feel to correct me anyone) fastboot installs a boot image and a recovery image. The boot image allows UT to boot, but you usually have to manually boot to recovery. Once in recovery ADB is then working and the UT install will continue by pushing the UT files over it from the PC to the device.
A bad or incompatible USB cable will stop ADB from functioning so no UT install.
An encrypted data partition will stop an install and can be flagged as an ADB error, that is why you have to format the data partition to EXT4 and wipe it so it is decrypted.
If the partitions have been resized, usually by installing a non stock ROM such as Lineage OS, UT won't install and may give an ADB error.
A bad or USB 3 port may cause an ADB error.
A PC/laptop may cause an issue for various reasons, if UT won't install on Windows, try a Linux based machine or a MacOS based machine.
Try an older installer, the latest Ubports installer may be a bit buggy.
Also follow the installation instructions to the letter or the install usually fails. Try a different channel if the stable channel fails to install.
