@advocatux : thank you. I finally managed to install android on the phone with your help.
Unfortunately, the touchscreen keeps working bad with Android. I will ask a refund to aliexpress seller.
Have a nice day.

@advocatux : thank you. Actually, I had already downloaded this before but the zip does not contain the flash_all.sh. I can use fastboot to do it manually (source) but I do not know which .img files I must install nor if the order is critical. Below is the list of img files:

boot.img
boot-verified.img
cache.img
ramdisk.img
ramdisk-recovery.img
ramdisk-recovery-bthdr.img
recovery.img
recovery_bthdr.img
recovery-verified.img
secro.img
secro-verified.img
system.img
userdata.img

Below are the other files:

APDB_MT6582_S01_L0.MP2_W15.28
BPLGUInfoCustomAppSrcP_MT6582_S00_MOLY_WR8_W1449_MD_WG_MP_V1_1_wg_n
EBR1
lk.bin
lk-verified.bin
logo.bin
logo-verified.bin
MBR
MT6582_Android_scatter.txt
preloader_vegetahd.bin

thank you

Hi guys!
I recently broke the touchscreen of my "Aquaris E5 Ubuntu edition"-phone.
I bought another but it does not work properly. The screen has the android-3-buttons at the bottom which was not the case on the original one. I suspect it behaves differently from the original one. Actually, it looks like the touchscreen is not calibrated. There is a scale and an offset . I found no way to calibrate it in on UBports.

So ... I would like to try install an android system. I visited this page : https://docs.ubuntu.com/phone/en/devices/reinstalling-android but no android image is given for "BQ Aquaris E5 Ubuntu edition".

Could someone give a piece of advice about all that.
Thanks
Vincent