If you are sure of your choices, write the layout down to disk and continue your installation.

If it's to become a server, you can always remove unwanted software like libreoffice and whatever later, apt and synaptic do a very good job.
You might want to choose:
-  Devuan Destop environment
-  XFCE
-  web server
-  console productivity
-  ssh server
-  standard system utilities.

This shouldn't be that hard, the mentioned documentation is quite good.
The only critical thing may be the grub-install.
I mentioned it before, but if the new Devuan is the only OS ion your system, it should work, hopefully.
Good luck.

please choose devuan_daedalus_5.0.0_amd64_desktop.iso.

I only say I installed devuan_4.0 years ago.

Rufus can work normally to create a bootable usb.
Now I use dd(linux) to create a bootable usb.

I do not know how to partition, so I choose  "All files in one partition".

Only guess:
Bios,
F2->General->Boot Sequence->Boot List Option->UEFI->save.

If there is a Windows OS in the pc/laptop, and you choose install only one system,
when install the linux iso, please choose erase the old windows system. (Back up all your files.)

I installed devuan_4.0.0_amd64_desktop.iso, and chose "All files in one partition".

P.S.
Using torrent file can quickly download the iso, and can choose the only one iso, you want to download.

I checked. indicated by uffi.
windows is gone. I erased it with its sections.
I'll try to install via devuan_4.0.0_amd64_desktop.iso you mentioned
Can you please tell me with what program you used to create a bootable flash drive? If in rufus, did you specify the image recording through iso or did you specify dd?

If there is a Windows OS in the pc/laptop, and you choose install only one system,
when install the linux iso, please choose erase the old windows system. (Back up all your files.)

I installed devuan_4.0.0_amd64_desktop.iso, and chose "All files in one partition".

P.S.
Using torrent file can quickly download the iso, and can choose the only one iso, you want to download.

There is one step what may be failing, after UEFI GRUB is installed its EFI binary must be "introduced" to the EFI BIOS. If this step fails then you get this error. Presuming there are no other EFI binaries.
I'd boot from an external media and check if GRUB binary is present somewhere in ../boot/efi/. If it is then copying it to ../boot/efi/bootx64.efi will make your system bootable, this is the default location by UEFI standard and the executable there is found without registering it with UEFI BIOS beforehand.

P. S. You absolutely sure your computer has UEFI BIOS?

Yes. even in the bios itself it is indicated

P. S. You absolutely sure your computer has UEFI BIOS?

Can't remember for sure, but one of the installations I did needed to be connected to the internet for the grub files to download & be installed - it may have been this one, but wouldn't harm trying.

Connected the Internet, reinstalled OS - did not help.

Please try again.
Use another pc or smart phone to see the steps of installation guide, and install the iso again.
Please write down the details of the steps of installation.

I follow the below guide,
https://www.devuan.org/os/documentation … installing

diffrent from yours:
https://www.devuan.org/os/documentation … s/live-gui

You can check the bios, to see if there are any boot system.

the link with the instruction that you threw off implies the installation of devuan linux through the "netinstaller" and "server" disks
I tried to install linux with them earlier, but nothing worked. I just didn't even get the installation screen

how i installed os:
1) I created a bootable flash drive using rufus
2) Started the computer via a flash drive in live mode.
3) ran the install devuan shortcut and got the following message:
the dekstop file "refractainstaller.dekstop" is in an insecure location and not marked as executable
pressed launch anyway.
4) the terminal opened, the message "this utility will install live usb to your had drive" appeared
5) a message appeared: EFi partition found at /dev/sda1
6) installation options: check boxes 1,3,5
7) started gparted. created 5 partitions /dev/sda. (top right is /devsda (223 GiB))
8) installed OS to /dev/sda5 (142 GiB)
9) chose another partition for /home
10) chose another partition for swap
11) SUMMARY:
retelling of points 5), 8), 9)
dekstop autologin will be disabled, console autologin will be disabled, UUIDS willl be used crypttab, /dev/mapped/name will be used fstab
pre-install scripts are enabled
post install scripts are enabled.
clicked on the button processed with the installation
12) Next, I entered geographic area, locales, Set the keyboard type, keyboard layout, Set special keys, Set an encryption passphrase,
13) Confirm the installation partition.
14) system installation started
15) Install bootloader.
  install otloader and finish the installation.
chroot: will be open an xtem in the chrooted installation for custom work.
/dev/sda1 should already be mounted to target/boot/efi/
continue: will proceed whether or not you have installed a bootloader. if not, you will need to have another way to boot this installation
abort: will exit the installer and abort the installation.
clicked install botloader.
  - setting up grub botloader.. please wait .
16) configure hostname and username
17) Refracta UFFI/BIOS installer.
installation comlete.
you may now reboot into new system.
remember to remove your installation media

@Charon795, which ISO file did you download? Does it have a filename?

Devuan_daedalus_5.0.0_amd64_dekstop-live

One note concerning OS booting:
when you had a Windows on the system before installing linux, chances are high in your UEFI settings the "Secure Boot" option is enabled.
I suggest to disable Secure Boot. I only had the worst of all experiences with Secure Boot. (Thank you, Microsoft, grrmbllh!)

security boot disabled.