@Luksus Thank you for the info! As soon as I find time to, I will try this too!

@Lakotaubp I'm using the latest version (0.2.25-Beta), as stated above, it works when setting the phone to fastboot mode prior to launching the installer. I'm not sure whether I want to reflash the original UT image with proprietary tools, maybe I will contact bq regarding that issue and see if they can help me with unlocking the bootloader.

I'm pretty sure that the device they sent back to me was a new one as the WiFi and Bluetooth MAC adresses didn't match the ones of the device I sent to them initially. It really seems like they flashed a stock item and locked the bootloader afterwards, maybe with a newer firmware or bootloader version that is not unlockable in the same way as the original devices.

@Lakotaubp The installer still says that the bootloader needs to be unlocked. I think the unlock command didn't work (it didn't even terminate).

@Lakotaubp The device is listed by

adb devices

(yes, I authorized the device by accepting the popup) and after

adb reboot bootloader

it is also listed when executing

fastboot devices

but the subsequent command

sudo fastboot oem unlock

starts, prints some whitespaces and then does nothing.

@Lakotaubp I tried as you suggested, but

sudo fastboot oem unlock

simply hangs after printing a bunch of whitespace characters. I assume that the installer got stuck the same way. Is there any guide on how to unlock the bootloader of the E5? I found some guides for other bq models but none specifically for the E5.

@Lakotaubp I expect I need to switch the device to fastboot mode prior to performing the OEM unlock? I will try it tomorrow.

In theory yes, snaps can be run with Manjaro, but the snap support is still experimental and I do not want a snap error to make my phone a pricy paperweight.

@Lakotaubp As I already wrote above, the installer hangs at the point depicted in the image. This also didn't change for about an hour, so I closed the installer, disconnected the device and shut the phone down by holding the volume up and power buttons for about seven seconds. I can still successfully boot into the Canonical Ubuntu Touch, it seems like the installer did nothing at all. I don't think that trying it again would be successful. Is it possible to do the OEM unlock prior to launching the installation process so the installer can directly start its work?

Unfortunately I have no other choice than using the AppImage as the Snap support is not yet finished for my OS.

Should I file an issue on Github regarding that the phone cannot be automatically OEM unlocked?

No, there is no indication of progress. Neither a filling progress bar in the installer nor some log on the console. Just the animation in the background window (appearing and disappearing dots, circle spinning around the robot).

Thank you @advocatux and @Lakotaubp!

I managed to get the latest installer (0.2.5-Beta) running by manually switching to Fastboot mode using

adb reboot bootloader

as described here and manually selecting the device as suggested by @advocatux in this thread. The installer shows the same prompt as in version 0.1.21-Beta:

Unfortunately, it seems to hang now as the prompt doesn't disappear after clicking "Unlock". The terminal says:

Pug interceptor registered successfully
info: Welcome to UBports Installer version 0.2.5-beta!
warn: This is not the latest stable release!
info: vegetahd selected
info: Instructing manual reboot
info: Press and hold the volume down and power buttons until the phone reboots.
info: fastboot: wait for device
info: Download complete
info: Flashing images...

Is this normal? Do I just have to wait?

Hi!

Long story short:
I want to install UBports Ubuntu Touch on my bq Aquaris E5 HD Ubuntu Edition using the UBports Installer. Due to this and comparable issues I fell back to installer version 0.1.21-beta. The installer runs fine but once the files need to be flashed to the device it says that it needs to be OEM unlocked. I thought it wasn't necessary to do an OEM unlock on devices running the Canonical Ubuntu Touch, or am I wrong? Is this an issue with the (old) installer? As I could not find any information on this, I appreciate your help.

Long story long:
I own a bq Aquaris E5 HD Ubuntu Edition running the latest Canonical Ubuntu Touch (Ubuntu 15.04 OTA-15) and finally found the time to switch to UBports Ubuntu Touch. To do so, I'm running the AppImage version of the installer under Manjaro (Arch Linux). The release version 0.2.3-Beta doesn't work properly for me and fails with the same symptoms as described here, in short: There is no button to start the installation.

In this blog post it works with version 0.1.21-Beta with a bq Aquaris E4.5, so I tried it. This version runs fine, but after the download and switching my phone to bootloader / fastboot mode the installer says that the device needs to be OEM unlocked. I could not find any information on this except that it is necessary to enable the OEM unlock in developer mode on Android devices. I'm unsure whether this is a bug in the installer, something that always occurs when switching Canonical Ubuntu Touch devices to UBports Ubuntu Touch or a special case for my device. The last point came to my mind because I sent my phone to bq to let them "repair" it after I broke the display. In fact they sent back a completely new device. I don't know if that my have something to do with this issue.

Thanks for your help in advance!