I can't boot GRUB nor Windows boot manager after installation

So this is my first time installing a UNIX operating system so i chose lubuntu on my old computer and created a live usb, after "successfully" installing it and booting back in I could only log into Windows and looked up how to boot into lubunto changing the Boot Manager so I found this "guide"

https://itsfoss.com/no-grub-windows-linux/

where it tells you how to change the boot manager and entered the following commands:


bcdedit /set {bootmgr} path \EFI\lubuntu\grubx64.efi


The command prompt marked the operation as successful so I restarted my PC and naturally it screwed up the boot manager and now it "can't find a boot manager or disk failed" so the same "guide" tells you to boot from a windows installation disk and after burning one and booting it from SATA0 it can't do that either it gives me the same error.

So the only way I can boot is running the lubuntu trial version from the USB. and i performed boot repair and this is the information I got, how do I proceed from here?


boot-repair-4ppa102 [20200507_2037]


============================== Boot Info Summary ===============================


=> Grub2 (v2.00) is installed in the MBR of /dev/sda and looks at sector
1816348800 of the same hard drive for core.img. core.img is at this
location and looks for (,gpt5)/boot/grub. It also embeds following
components:

modules
---------------------------------------------------------------------------
fshelp ext2 part_gpt biosdisk
---------------------------------------------------------------------------
=> Syslinux MBR (4.04-4.07) is installed in the MBR of /dev/sdf.


sda1: __________________________________________________ ________________________


File system: ntfs
Boot sector type: Windows 8/2012: NTFS
Boot sector info: No errors found in the Boot Parameter Block.
Operating System:
Boot files:


sda2: __________________________________________________ ________________________


File system: vfat
Boot sector type: Windows 8/2012: FAT32
Boot sector info: No errors found in the Boot Parameter Block.
Operating System:
Boot files: /efi/Boot/bootx64.efi /efi/HP/SystemDiags/CryptRSA.efi
/efi/HP/SystemDiags/CryptRSA32.efi
/efi/HP/SystemDiags/SystemDiags.efi
/efi/HP/SystemDiags/SystemDiags32.efi
/efi/HP/SystemRecovery/bootmgfw.efi
/efi/Microsoft/Boot/bootmgfw.efi
/efi/Microsoft/Boot/bootmgr.efi
/efi/Microsoft/Boot/memtest.efi


sda3: __________________________________________________ ________________________


File system:
Boot sector type: -
Boot sector info:


sda4: __________________________________________________ ________________________


File system: ntfs
Boot sector type: Windows 7/2008: NTFS
Boot sector info: No errors found in the Boot Parameter Block.
Operating System: Windows 8
Boot files: /bootmgr /Boot/BCD /Windows/System32/winload.exe


sda5: __________________________________________________ ________________________


File system: ext4
Boot sector type: -
Boot sector info:
Operating System: Ubuntu 19.10
Boot files: /boot/grub/grub.cfg /etc/fstab /etc/default/grub
/boot/grub/i386-pc/core.img


sda6: __________________________________________________ ________________________


File system: ntfs
Boot sector type: Windows 8/2012: NTFS
Boot sector info: No errors found in the Boot Parameter Block.
Operating System:
Boot files:


sda7: __________________________________________________ ________________________


File system: ntfs
Boot sector type: Windows 8/2012: NTFS
Boot sector info: No errors found in the Boot Parameter Block.
Operating System:
Boot files: /bootmgr /boot/bcd


sdf1: __________________________________________________ ________________________


File system: ntfs
Boot sector type: SYSLINUX 4.07 2013-07-25
Boot sector info: Syslinux looks at sector 19528 of /dev/sdf1 for its
second stage. SYSLINUX is installed in the /uui
directory. No errors found in the Boot Parameter Block.
Operating System:
Boot files: /boot/grub/menu.lst




================================ 3 OS detected =================================


OS#1: Windows 8 on sda4
OS#2: Ubuntu 19.10 on sda5
OS#3: Windows Recovery Environment (boot) on sda7


============================ Architecture/Host Info ============================


CPU architecture: 64-bit
Live-session OS is Ubuntu 64-bit (Ubuntu 19.10, eoan, x86_64)


===================================== UEFI =====================================


BIOS is EFI-compatible, but it is not setup in EFI-mode for this live-session.


cb8e4284804d56f058c0e1cf111eeedd sda2/Boot/bootx64.efi
6488d391f74263c9da3c3d47dffa6212 sda2/HP/SystemDiags/CryptRSA.efi
1b8c0684ede8539ccc205cf7a750eca3 sda2/HP/SystemDiags/CryptRSA32.efi
0c2035ed413a8f352b7d315121f2d8c0 sda2/HP/SystemDiags/SystemDiags.efi
d39ce8435f3b31816bd72676fd528de8 sda2/HP/SystemDiags/SystemDiags32.efi
87b6d22295a16073d8d456fc574441a8 sda2/HP/SystemRecovery/bootmgfw.efi
cb8e4284804d56f058c0e1cf111eeedd sda2/Microsoft/Boot/bootmgfw.efi
3df357ffd0654bb80f2a575485e6e0cc sda2/Microsoft/Boot/bootmgr.efi
ff6d345785671fbcea9561a3cbc47702 sda7/Boot/bootx64.efi
2d6c4295c7b479c60687d82ae80421b7 sda7/Boot/bootx64.efi.efi
9f1c9510b4c944decbb563a3dbe39e6d sda7/Microsoft/Boot/cdboot.efi
acc978f561b2b06c5cf241ce37439fa2 sda7/Microsoft/Boot/cdboot_noprompt.efi




============================= Drive/Partition Info =============================




Disks info: __________________________________________________ __________________


sda : GPT, noBIOSboot, has---ESP, not-usb, not-mmc, has-os, 2048 sectors * 512 bytes
sdf : not-GPT, noBIOSboot, has-noESP, usb-disk, not-mmc, no-os, 2048 sectors * 512 bytes


Partitions info (1/3): __________________________________________________ _______


sda1 : no-os, 32, nopakmgr, no-docgrub, nogrub, nogrubinstall, no-grubenv, noupdategrub, not-far
sda2 : no-os, 32, nopakmgr, no-docgrub, nogrub, nogrubinstall, no-grubenv, noupdategrub, not-far
sda4 : is-os, 32, nopakmgr, no-docgrub, nogrub, nogrubinstall, no-grubenv, noupdategrub, farbios
sda6 : no-os, 32, nopakmgr, no-docgrub, nogrub, nogrubinstall, no-grubenv, noupdategrub, farbios
sda7 : is-os, 32, nopakmgr, no-docgrub, nogrub, nogrubinstall, no-grubenv, noupdategrub, farbios
sdf1 : no-os, 32, nopakmgr, no-docgrub, nogrub, nogrubinstall, no-grubenv, noupdategrub, not-far
sda5 : is-os, 64, apt-get, grub-pc , grub2, grub-install, grubenv-ok, update-grub, farbios


Partitions info (2/3): __________________________________________________ _______


sda1 : isnotESP, part-has-no-fstab, notbiosboot, no-nt, no-winload, recovery-or-hidden, no-bmgr, notwinboot
sda2 : is---ESP, part-has-no-fstab, notbiosboot, no-nt, no-winload, no-recov-nor-hid, no-bmgr, notwinboot
sda4 : isnotESP, part-has-no-fstab, notbiosboot, no-nt, haswinload, no-recov-nor-hid, bootmgr, is-winboot
sda6 : isnotESP, part-has-no-fstab, notbiosboot, no-nt, no-winload, recovery-or-hidden, no-bmgr, notwinboot
sda7 : isnotESP, part-has-no-fstab, notbiosboot, no-nt, no-winload, recovery-or-hidden, bootmgr, is-winboot
sdf1 : isnotESP, part-has-no-fstab, notbiosboot, no-nt, no-winload, no-recov-nor-hid, no-bmgr, notwinboot
sda5 : isnotESP, fstab-without-efi, notbiosboot, no-nt, no-winload, no-recov-nor-hid, no-bmgr, notwinboot


Partitions info (3/3): __________________________________________________ _______


sda1 : not-sepboot, no-boot, part-has-no-fstab, not-sep-usr, no---usr, part-has-no-fstab, std-grub.d, sda
sda2 : not-sepboot, no-boot, part-has-no-fstab, not-sep-usr, no---usr, part-has-no-fstab, std-grub.d, sda
sda4 : not-sepboot, no-boot, part-has-no-fstab, not-sep-usr, no---usr, part-has-no-fstab, std-grub.d, sda
sda6 : not-sepboot, no-boot, part-has-no-fstab, not-sep-usr, no---usr, part-has-no-fstab, std-grub.d, sda
sda7 : not-sepboot, no-boot, part-has-no-fstab, not-sep-usr, no---usr, part-has-no-fstab, std-grub.d, sda
sdf1 : is-sepboot, no-kernel, part-has-no-fstab, not-sep-usr, no---usr, part-has-no-fstab, std-grub.d, sdf
sda5 : not-sepboot, with-boot, fstab-without-boot, not-sep-usr, with--usr, fstab-without-usr, std-grub.d, sda


fdisk -l (filtered): __________________________________________________ _________


Boot Start End Sectors Size Id Type
loop0p1 * 0 3283711 3283712 1.6G 0 Empty
loop0p2 3257860 3265795 7936 3.9M ef EFI (FAT-12/16/32)
Disk sda: 931.53 GiB, 1000204886016 bytes, 1953525168 sectors
Start End Sectors Size Type
sda1 2048 2097151 2095104 1023M Windows recovery environment
sda2 2097152 2834431 737280 360M EFI System
sda3 2834432 3096575 262144 128M Microsoft reserved
sda4 3096576 1707017618 1703921043 812.5G Microsoft basic data
sda5 1707018240 1911816191 204797952 97.7G Linux filesystem
sda6 1911818240 1912870911 1052672 514M Windows recovery environment
sda7 1912870912 1953523711 40652800 19.4G Microsoft basic data
Disk sdf: 7.27 GiB, 7803174912 bytes, 15240576 sectors
Boot Start End Sectors Size Id Type
sdf1 * 8064 15240575 15232512 7.3G 7 HPFS/NTFS/exFAT
Disk zram0: 1.15 GiB, 1226534912 bytes, 299447 sectors
Disk zram1: 1.15 GiB, 1226534912 bytes, 299447 sectors
Disk zram2: 1.15 GiB, 1226534912 bytes, 299447 sectors
Disk zram3: 1.15 GiB, 1226534912 bytes, 299447 sectors


parted -lm (filtered): __________________________________________________ _______


sda:1000GB:scsi:512:4096:gpt:ATA WDC WD10EZEX-60Z:;
1:1049kB:1074MB:1073MB:ntfs:Basic data partition:hidden, diag;
2:1074MB:1451MB:377MB:fat32:EFI system partition:boot, esp;
3:1451MB:1585MB:134MB::Microsoft reserved partition:msftres;
4:1585MB:874GB:872GB:ntfs:Basic data partition:msftdata;
5:874GB:979GB:105GB:ext4::;
6:979GB:979GB:539MB:ntfs::hidden, diag;
7:979GB:1000GB:20.8GB:ntfs:Basic data partition:hidden, msftdata;
sdf:7803MB:scsi:512:512:msdos:Kingston DataTraveler 2.0:;
1:4129kB:7803MB:7799MB:ntfs::boot;
zram3:1227MB:unknown:4096:4096:loop:Unknown:;
1:0.00B:1227MB:1227MB:linux-swap(v1)::;
zram1:1227MB:unknown:4096:4096:loop:Unknown:;
1:0.00B:1227MB:1227MB:linux-swap(v1)::;
zram2:1227MB:unknown:4096:4096:loop:Unknown:;
1:0.00B:1227MB:1227MB:linux-swap(v1)::;
zram0:1227MB:unknown:4096:4096:loop:Unknown:;
1:0.00B:1227MB:1227MB:linux-swap(v1)::;


blkid (filtered): __________________________________________________ ____________


NAME FSTYPE UUID PARTUUID LABEL PARTLABEL
sda
sda1 ntfs 72E869BFE8698269 65d6f5af-d903-4200-84a1-23e8ce1c139e Windows RE tools Basic data partition
sda2 vfat 64B5-5C36 c2949a00-a361-44d0-b4f6-4f2ce551d273 SYSTEM EFI system partition
sda3 2a494061-1e73-465c-91ae-80e4cca6924b Microsoft reserved partition
sda4 ntfs 244079FD4079D5D0 8ec6ab96-c56b-4117-aaa9-98c04fd7f7dc OS Basic data partition
sda5 ext4 912fa4dc-4b58-4999-a2b4-2a6b1ce6dac4 ca47f1ae-0c6c-4cf9-ab94-b1fc7d358712
sda6 ntfs 24DCF0ADDCF07A7E 18268f92-9ed3-4b42-82f9-89b0ebf37e99
sda7 ntfs 7804FEC704FE8780 3873d5cb-8737-4bea-bdb8-54a69eebc1fa Recovery Image Basic data partition
sdf
sdf1 ntfs 902C464B2C462C92 c3072e18-01 UUI
zram0
zram1
zram2
zram3


df (filtered): __________________________________________________ _______________


Avail Use% Mounted on
sda1 676.4M 34% /mnt/boot-sav/sda1
sda2 321.9M 10% /mnt/boot-sav/sda2
sda4 273.4G 66% /mnt/boot-sav/sda4
sda5 86.3G 5% /mnt/boot-sav/sda5
sda6 86.4M 83% /mnt/boot-sav/sda6
sda7 516.7M 97% /mnt/boot-sav/sda7
sdf1 5.6G 23% /isodevice


Mount options: __________________________________________________ ________________


sda1 rw,relatime,user_id=0,group_id=0,allow_other,blksi ze=4096
sda2 rw,relatime,fmask=0022,dmask=0022,codepage=437,ioc harset=iso8859-1,shortname=mixed,errors=remount-ro
sda4 ro,relatime,user_id=0,group_id=0,allow_other,blksi ze=4096
sda5 rw,relatime
sda6 rw,relatime,user_id=0,group_id=0,allow_other,blksi ze=4096
sda7 rw,relatime,user_id=0,group_id=0,allow_other,blksi ze=4096
sdf1 rw,relatime,user_id=0,group_id=0,allow_other,blksi ze=4096


====================== sda5/boot/grub/grub.cfg (filtered) ======================


Ubuntu
Ubuntu, with Linux 5.3.0-18-generic
Windows 8 (on /dev/sda4)
Windows Recovery Environment (on /dev/sda7)
### END /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_uefi-firmware ###


========================== sda5/etc/fstab (filtered) ===========================


# <file system> <mount point> <type> <options> <dump> <pass>
UUID=912fa4dc-4b58-4999-a2b4-2a6b1ce6dac4 / ext4 defaults 0 1


======================= sda5/etc/default/grub (filtered) =======================


GRUB_DEFAULT=1
GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=0
GRUB_DISTRIBUTOR='Ubuntu'
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xe fefefef"
#GRUB_TERMINAL=console
#GRUB_GFXMODE=640x480
#GRUB_DISABLE_LINUX_UUID=true
#GRUB_DISABLE_RECOVERY="true"
#GRUB_INIT_TUNE="480 440 1"


==================== sda5: Location of files loaded by Grub ====================


GiB - GB File Fragment(s)


899.343143463 = 965.662347264 boot/grub/grub.cfg 3
866.102622986 = 929.970610176 boot/grub/i386-pc/core.img 1
904.180660248 = 970.856591360 boot/vmlinuz 2
904.180660248 = 970.856591360 boot/vmlinuz-5.3.0-18-generic 2
904.180660248 = 970.856591360 boot/vmlinuz.old 2
904.293853760 = 970.978131968 boot/initrd.img 2
904.293853760 = 970.978131968 boot/initrd.img-5.3.0-18-generic 2
904.293853760 = 970.978131968 boot/initrd.img.old 2


====================== sdf1/boot/grub/menu.lst (filtered) ======================


# This Menu created with Universal USB Installer https://www.pendrivelinux.com
default 0
timeout 30
color NORMAL HIGHLIGHT HELPTEXT HEADING
foreground=FFFFFF
background=000000
title Boot lubuntu-19.10-desktop-amd64
set ISO=/lubuntu-19.10-desktop-amd64.iso
set CASPER=/casper-rw
find --set-root %ISO%
map %ISO% (0xff)
#CLUG
map --hook
root (0xff)
kernel /casper/vmlinuz file=/preseed/lubuntu.seed noprompt boot=casper iso-scan/filename=%ISO% quiet --
initrd /casper/initrd
title Boot lubuntu-19.10-desktop-amd64 acpi=off
set ISO=/lubuntu-19.10-desktop-amd64.iso
set CASPER=/casper-rw
find --set-root %ISO%
map %ISO% (0xff)
#CLUG
map --hook
root (0xff)
kernel /casper/vmlinuz file=/preseed/lubuntu.seed noprompt boot=casper iso-scan/filename=%ISO% quiet acpi=off --
initrd /casper/initrd


==================== sdf1: Location of files loaded by Grub ====================


GiB - GB File Fragment(s)


?? = ?? boot/grub/menu.lst 1
?? = ?? vmlinuz 1
?? = ?? initrd 1




========= Devices which don't seem to have a corresponding hard drive ==========


sdb sdc sdd sde




=============================== StdErr Messages ================================


/dev/sdb: open failed: No medium found
/dev/sdc: open failed: No medium found
/dev/sdd: open failed: No medium found
/dev/sde: open failed: No medium found


Suggested repair: __________________________________________________ ____________


The default repair of the Boot-Repair utility would purge (in order to fix packages) and reinstall the grub-efi-amd64-signed of
sda5,
using the following options: sda2/boot/efi,
Additional repair would be performed: unhide-bootmenu-10s use-standard-efi-file


Blockers in case of suggested repair: __________________________________________


The current session is in Legacy mode. Please reboot the computer, and use this software in an EFI session. This will enable this feature. For example, use a live-USB of Boot-Repair-Disk-64bit (www.sourceforge.net/p/boot-repair-cd), after making sure your BIOS is set up to boot USB in EFI mode.


Advice in case of suggested repair: ____________________________________________


The boot of your PC is in Legacy mode. You may want to retry after changing it to EFI mode.
Do you want to continue?


Final advice in case of suggested repair: ______________________________________


Please do not forget to make your BIOS boot on sda2/efi/****/shim****.efi (**** will be updated in the final message) file!


If your computer reboots directly into Windows, try to change the boot order in your BIOS.
If your BIOS does not allow to change the boot order, change the default boot entry of the Windows bootloader.
For example you can boot into Windows, then type the following command in an admin command prompt:
bcdedit /set {bootmgr} path \EFI\****\shim****.efi (**** will be updated in the final message)


The boot of your PC is in Legacy mode. You may want to retry after changing it to EFI mode.


Can someone please tell me how to boot from GRUB or change it back to windows?? Help would be greatly appreciated.