You access the debian (devuan) installer by booting one of the installer isos. The live isos use refractainstaller, which won't do raid or lvm. You want one of these:
https://files.roundr.devuan.org/devuan_ … aller-iso/

It's already in jessie. I see it in my i386 system and can download the package. In my amd64 system with multiarch, I can only download the amd64 version. Or maybe I don't know the right command to get it there.

apt-cache policy libpng12-0
libpng12-0:
  Installed: 1.2.50-2+deb8u2
  Candidate: 1.2.50-2+deb8u3
  Version table:
     1.2.50-2+deb8u3 0
        500 http://us.mirror.devuan.org/merged/ jessie/main i386 Packages
        500 http://pkgmaster.devuan.org/merged/ jessie/main i386 Packages
 *** 1.2.50-2+deb8u2 0
        500 http://auto.mirror.devuan.org/merged/ jessie-security/main i386 Packages
        500 http://pkgmaster.devuan.org/merged/ jessie-security/main i386 Packages
        100 /var/lib/dpkg/status

If you're running ascii, you'd use libpng16-16.

The example script doesn't work because it does not get the mac address correctly. The output of ifconfig changed from jessie to stretch/ascii and no longer shows HWaddr.

Edit get-mac-address.sh and change

mac=$(/sbin/ifconfig "$iface" | sed -n -e '/^.*HWaddr \([:[:xdigit:]\-]*\).*/{s//\1/;y/ABCDEF/abcdef/;p;q;}')

to

mac=$(/bin/ip link | grep -A1 "$iface" | awk '/link/ { print $2 }')

Note: If your mac addresses have any upper case letters, the above line will need more than I can give you right now.

I think this is right, but I haven't tested it. See 'man interfaces' and also look at the files in /usr/share/doc/ifupdown/examples.

Copy the get-mac-address.sh script from the examples directory into /etc/network/interfaces.d/ and make it executable. Then edit the interfaces file like this:

auto enp3s0 enp2s0
mapping enp3s0 enp2s0
  script /etc/network/interfaces.d/get-mac-address.sh
  map 00:55:44:33:22:11 eth0
  map 00:11:22:33:44:55 eth1
iface eth0 inet dhcp
iface eth1 inet static
	address 192.168.1.17
	netmask 255.255.255.0
	network 192.168.1.0
	broadcast 192.168.1.255

I think that's still the right place to put your own rules, but I don't really know much about udev rules or what goes into them. Did you try using KERNEL=="enp*" instead of KERNEL=="eth*"? (just a guess)

Another possibility is to rename the interfaces in /etc/network/interfaces. See the section on MAPPING in man interfaces. You should be able to give them any names you want.

Install xinit. You might need to do this even if you install xorg, which is a metapackage that gives you all the drivers. Without that metapackage, make sure you have xserver-xorg-video-whatever, where whatever is the right one for the Pi3.

Here's some relevant infomation from the release notes:

All the live isos have non-free wireless firmware already installed (except for a few broadcom packages) and all the installer isos have non-free wireless and other firmware packages in /firmware in the iso.

For the icon sets that aren't working, check their Recommends, which are excluded by default. Something is probably missing.

If you want icons on the desktop and a background image, the easiest way to do it is to set spacefm to control the desktop.

Start the installer and select Help or else read /usr/share/doc/refractainstaller-base/readme.refractainstaller.txt (same thing).

Yes, if you click on the desktop icon to increase the font size, the font size is increased and no longer fits in the allotted space for the unhighlighted desktop icons. Same as if the icons name is too long to fit in that space. When you click on the icon to hightlight it, that one icon is given more space so that the full name shows. This is true with large font the same as with a long file name.

Refractainstaller will automatically format the selected partitions to your choice of ext2/3/4 unless you tell it not to. Other filesystem formats are possible by pre-formatting your partitions and telling the installer not to format. This information is in the Help available from within the installer.

The live installer provides the exact same debconf dialogues for locales, time zone and keyboard as the debian-installer. (same as if you run dpkg-reconfigure locales|tzdata|keyboard-configuration)

There's already a Report button at the bottom of each post, but it looks like it hardly ever gets used. 90% of the reports are for spam, and we don't even get those anymore. (Thanks, Ralph!) Maybe we just need to point out that button's existence in the top post. Or maybe we don't - this is a pretty calm board, even when it heats up.

The installer in the live isos does not do any automatic partitioning. After you close gparted, you should get questions about where to put the OS, and if you made separate partitions for /home or /boot, you get to select those, too.

Some lenovos won't let you use legacy boot. I don't know the details on that.

If you're booting in uefi mode, you will need to re-partition your drive.
In gparted, first go to the Device menu and write a new gpt partition table. You must have left it set for msdos.

At minimum, you will need a partition for the OS and an efi partition (with esp and boot flags). The swap partition is optional - the installer will create a swapfile if there's no swap partition.

If you want to use a gpt-partitioned disk with legacy boot, you need to create a special partition for that. It must be >1MB and unformatted. (It's at the bottom of the list of filesystem types in gparted). And it must have the bios_grub flag.