Here is the abstract of the install process made for my daugther on a BQ E5 Ubuntu Edition
To succeed, we widely did otherwise than explained in the official informations.
This is why I think that this could be usefull for you.
We started here and had a close look to this video. We (hardly, because it's fleeting) got a false information about how to go in bootloader mode. We have known later that this was not usable for BQ E5 ... But let's tell the story.
According to this, that, then that, and finally that we didn't know what to load. We finally found this. Well ! Having Mint 18.3, we downloaded ubports-installer_0.1.12-beta_amd64.deb and tried to launch. But my desktop is 32 bits, not 64 so it failed. I tried also Appimage and looked to snappy without succes. So I decided to install a Mint 18.3 64 bits fresh disk and was able (some time later) to install the deb file ...
What did not work :
Following the instruction of UBports installer, keeping in mind the video seen above, there was no detection. We tried a manual selection, launched the install process but were not able to switch to bootloader mode. As we discovered later here we switched in Factory Mode instead.
What is not clear too in the video is if the device must be on or off when connecting it.
We tried several times without luck, and saw that the "Developper Mode" was not persistent after some reboot so beware about that.
What succeeded (with UBports-installer and Mint 18.3 64 bits) :
- Power on the BQ E5 and set Developper Mode (SystemPreferences/About/DevelopperMode)
- Open a terminal and type adb devices : this launches the adb daemon
- Connect the BQ E5 (always powered on) to the desktop
- Type adb devices once more : the device is listed
- A question appears on the BQ E5 with a key : you have to grant the connexion
- At this point, launch UBports installer : quick automatic detection !...
- The installer displays a "Switch to UBports" option : select it then install
- The BQ E5 is switched to Bootloader Mode automatically
- Then follow the indications (the password requested is the one of your desktop, not the one of your BQ)
- 12 files Downloaded (the first one is long with ADSL), then 13 files pushed to the device (quicker)
- Then the device reboots and installs the files (about 5 minutes), then reboots once more running UBports
You're done !
Hope this can help