Thank you all for help, finally I've managed to read some details about Linux booting, UEFI and GRUB, hence it works for me again (hopefully). I'd recommend links as follows: https://help.ubuntu.com/community/Grub2/Installing https://wiki.archlinux.org/index.php/GRUB#UEFI_systems https://www.zdnet.com/article/hands-on-linux-uefi-multi-boot-part-three-problem-solving/ and - of course - https://www.rodsbooks.com/refind/ PS Sorry for the delay.
I've forgotten: feel free and close this issue.
Well, acccording to the indent of this post of yours I'm confused a little bit. Is it your response to my post above? And I'd like to add that I can see all boot options (rEFInd / Ubuntu / AV Linux) within the BIOS settings...
Well, acccording to the indent of this post of yours I'm confused a little bit. It is yout responce to my post above? And I'd like to add that I can see all boot options (rEFInd / Ubuntu / AV Linux) within the BIOS settings...
...well, I've done a big mistake, I'd say. I booted into my SystemRescueCD on usb, run gparted and looked for some warnings / errors. To my big surprise there was some warning on the EFI (ESP) partition. I cannot to reproduce the message at all, it went somehow "... unable ...label :: ..." (sorry for that). And other partitions were OK. So I chose repair... ... and now I cannot boot to any of systems installed, even there's no rEFInd splash screen on my notebook any more! At the moment I'm in the...
...well, I've done a big mistake, I'd say. I booted into my SystemRescueCD on usb, run gparted and looked for some warnings / errors. To my big surprise there was some warning on the EFI (ESP) partition. I'm vannot to reproduce the message, it went somehow "... unable ...label :: ..." (sorry for that). And other partitions were OK. So I chose repair... ... and I cannot boot to any of systems installed, even there's no rEFInd splash screen any more! At the moment I'm in the middle of googling for...
Yes, can see just the rEFInd splash screen (logo) but no icons whatsoever. So I'll try your further advice...
# ls -R /boot/efi && ls /boot /boot/efi: EFI /boot/efi/EFI: avlinux BOOT refind tools ubuntu /boot/efi/EFI/avlinux: grubx64.efi /boot/efi/EFI/BOOT: BOOTX64.EFI fbx64.efi /boot/efi/EFI/refind: BOOT.CSV drivers_x64 icons icons-backup keys refind.conf refind.conf.000000-000000.ORIG refind.conf-sample refind_x64.efi themes /boot/efi/EFI/refind/drivers_x64: ext4_x64.efi /boot/efi/EFI/refind/icons: arrow_left.png func_about.png func_firmware.png func_shutdown.png os_bionic.png os_clover.png os_elementary.png...