[SOLVED] Trying to install LMDE4 on laptop Lenovo Ideapad 110-15ibr

Trying to install Linux LMDE4 2021 on laptop Lenovo Ideapad 110-15ibr 2016 after replacing old HDD Samsung 1000GB with new Samsung SSD 120GB; I can only enter BIOS by pushing F1 which gives me the warning: EFI network0 for IPv4 (C8-5B-76-QA-CF-F4) boot failed!!! Please, could anybody tell me what I have to do now? Seems like I am locked out of booting... And yes, I've already been trying F1, F2, F12, and reset switch.
Any REAL help will be very much appreciated!

How did you put the iso onto the usb?
Did you try fn- f2

Originally Posted by colorpurple21859 How did you put the iso onto the usb? Did you try fn- f2

Thank you for asking. Yes, I've tried absolutely everything that's already mentioned on the internet; but so far without any success. Using an external DVD player on USB, I can enter bios through Fn-F2 and it sees the DVD, but then it tells: EFI network 0 for IPv4 (C8-5B-76-0A-CF-F4) boot failed!!! Three exclamation marks.
I'm sure I've read someplace that a certain Lenovo series has been BLOCKED by its vendor from using boot; but just cannot find the article anymore. I've also tried both a Windows DVD and a few Linux DVD's, but the bios seems to be stuck and nothing else works anymore, with or without Fn- F1 through F12. Please help me...

Are you using a 64 or 32 bit iso?
Maybe booting from a usb key instead of a usb dvd player will work. If you have a spare usb key rufus is a good windows program to put the iso onto a usb https://rufus.ie/en_US/
sometime the dd mode works better then the default mode

Options to check for in the bios: secure boot disabled, fast boot disabled, if there is an option for type of OS.

Based on the information in your posts, your Lenovo has one 128GB SSD as the only drive with no OS or data on it, correct?
Did this computer previously have an OS on it? What was it and which release? Was it installed EFI or Legacy/CSM mode?
Is your SSD recognized in the BIOS? Are you booting UEFI or Legacy?

Originally Posted by colorpurple21859 Options to check for in the bios: secure boot disabled, fast boot disabled, if there is an option for type of OS.

Here is the culprit! Secure Boot is ENABLED and there is no way to switch it off. So I am now waiting for Windows to be installed and updated towards 20H2 which is costing at least four hours if everything is going correctly without any more troubles. Sigh...
Thank you very much for trying to help me! I will remember you in my prayers.
SOLVED

I think that LMDE4 (essentially Debian 10) supports secure boot?
https://www.fosslinux.com/35771/lmde...eboot-nvme.htm

Maybe enabling csm/legacy mode will disable secure boot