Hello, I have the same issue.
Installing debian 9 stretch, both cd (debian-9.5.0-amd64-xfce-CD-1.iso)
and the dvd versions.
Hangs at 12% : at the phase of installing "discover (amd64)"
I tried about 10 times.
Laptop is Packard Bell ENLG71BM-C05U
I used the additional drivers (from
http://cdimage.debian.org/cdimage/unofficial/non-free/firmware/stretch/20180714/),
and I put these .deb packages on another usb key : the effect is that I
don't have the step where they search for firmware for
rtlwifi/rtl8723befw.bin and rtl_nic/rtl8168g-2.fw
I don't have options to disable APCI in the bios.
I managed to install Opensuse on this computer, and there was Windows 10
working properly.
Any suggestion is welcome...