Dual boot fail, now no bootable device - boot repair output below

[kalpana]

Any help appreciated. Win10 Pro, attempted dual boot install of latest Ubuntu
ubuntu-22.04.3-desktop-amd64
Rufus complained it didn't have the right Grub & that it would download the required one
After install had Grub rescue prompt
And on restart no bootable device
Attempt a new install with full erase, and run into errors to do with Boot
Tried Boot repair utility, and Boot repair output:

Code:

Code Select Expand

boot-repair-4ppa203                                              [20230830_0621]

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

 => No boot loader is installed in the MBR of /dev/sda.
 => Syslinux MBR (5.00 and higher) is installed in the MBR of /dev/sdb.

sda1: __________________________________________________________________________

    File system:       ntfs
    Boot sector type:  Windows 8/10/11/2012: NTFS
    Boot sector info:  According to the info in the boot sector, sda1 has
                       102399 sectors, but according to the info from fdisk,
                       it has 1048575 sectors.
    Operating System: 
    Boot files:        /bootmgr

sda2: __________________________________________________________________________

    File system:       ext4
    Boot sector type:  -
    Boot sector info:
    Operating System: 
    Boot files:       

sdb1: __________________________________________________________________________

    File system:       vfat
    Boot sector type:  SYSLINUX 6.03
    Boot sector info:  Syslinux looks at sector 8216 of /dev/sdb1 for its
                       second stage. The integrity check of Syslinux failed.
                       No errors found in the Boot Parameter Block.
    Operating System: 
    Boot files:        /boot/grub/grub.cfg /syslinux.cfg
                       /efi/BOOT/grubx64.efi /ldlinux.sys


================================ 0 OS detected =================================


================================ Host/Hardware =================================

CPU architecture: 64-bit
Video: HD Graphics 630 from Intel Corporation
Live-session OS is Ubuntu 64-bit (Boot-Repair-Disk 64bit 20200604, bionic, x86_64)

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

BIOS/UEFI firmware: 1.25.0 from Dell Inc.
The firmware is EFI-compatible, and is set in EFI-mode for this live-session.
SecureBoot disabled (confirmed by mokutil).
BootCurrent: 0001
Timeout: 2 seconds
BootOrder: 0001
Boot0001* UEFI:  PMAP    PciRoot(0x0)/Pci(0x14,0x0)/USB(3,0)/HD(1,MBR,0x64c751f,0x800,0x3d3c00)..BO
Boot0007  Windows Boot Manager    VenHw(99e275e7-75a0-4b37-a2e6-c5385e6c00cb)WINDOWS.........x...B.C.D.O.B.J.E.C.T.=.{.9.d.e.a.8.6.2.c.-.5.c.d.d.-.4.e.7.0.-.a.c.c.1.-.f.3.2.b.3.4.4.d.4.7.9.5.}...l.............�...


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

Disks info: ____________________________________________________________________

sda    : is-GPT,    no-BIOSboot,    has---ESP,     not-usb,    not-mmc, no-os,    no-wind,    2048 sectors * 512 bytes

Partitions info (1/3): _________________________________________________________

sda1    : no-os,    64, nopakmgr,    no-docgrub,    nogrub,    nogrubinstall,    no-grubenv,    noupdategrub,    not-far
sda2    : no-os,    64, nopakmgr,    no-docgrub,    nogrub,    nogrubinstall,    no-grubenv,    noupdategrub,    farbios

Partitions info (2/3): _________________________________________________________

sda1    : is---ESP,    part-has-no-fstab,    no-nt,    no-winload,    no-recov-nor-hid,    bootmgr,    notwinboot
sda2    : isnotESP,    part-has-no-fstab,    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,    no--grub.d,    sda
sda2    : maybesepboot,    no-kernel,    part-has-no-fstab,    not-sep-usr,    no---usr,    part-has-no-fstab,    no--grub.d,    sda

fdisk -l (filtered): ___________________________________________________________

Disk sda: 119.2 GiB, 128035676160 bytes, 250069680 sectors
Disk identifier: DAB38F83-0332-4F0A-8DEF-5EA4C2CE2AC1
        Start       End   Sectors   Size Type
sda1     2048   1050623   1048576   512M EFI System
sda2  1050624 250068991 249018368 118.8G Linux filesystem
Disk sdb: 1.9 GiB, 2055733248 bytes, 4015104 sectors
Disk identifier: 0x064c751f
      Boot Start     End Sectors  Size Id Type
sdb1  *     2048 4015103 4013056  1.9G  c W95 FAT32 (LBA)
Disk zram0: 980.7 MiB, 1028288512 bytes, 251047 sectors
Disk zram1: 980.7 MiB, 1028288512 bytes, 251047 sectors
Disk zram2: 980.7 MiB, 1028288512 bytes, 251047 sectors
Disk zram3: 980.7 MiB, 1028288512 bytes, 251047 sectors

parted -lm (filtered): _________________________________________________________

sda:128GB:scsi:512:4096:gpt:ATA SK hynix SC308 S:;
1:1049kB:538MB:537MB:ntfs:EFI System Partition:boot, esp;
2:538MB:128GB:127GB:ext4::;
sdb:2056MB:scsi:512:512:msdos: :;
1:1049kB:2056MB:2055MB:fat32::boot, lba;

blkid (filtered): ______________________________________________________________

NAME   FSTYPE   UUID                                 PARTUUID                             LABEL           PARTLABEL
sda                                                                                                       
├─sda1 ntfs     6436754736751AEE                     978e272d-3108-4e97-8906-2a513e791a79 System Reserved EFI System Partition
└─sda2 ext4     a5fe72a3-099a-4827-8794-f20c915f07a1 833d93bd-a6e6-4e82-8d69-413436b325d0                 
sdb                                                                                                       
└─sdb1 vfat     6A88-FD89                            064c751f-01                          BOOT-REPAIR     

Mount points (filtered): _______________________________________________________

            Avail Use% Mounted on
/dev/sda1    41.8M  16% /mnt/boot-sav/sda1
/dev/sda2   110.4G   0% /mnt/boot-sav/sda2
/dev/sdb1     1.1G  45% /cdrom

Mount options (filtered): ______________________________________________________


====================== sdb1/boot/grub/grub.cfg (filtered) ======================

Boot-Repair-Disk session
Boot-Repair-Disk session (failsafe)

========================= sdb1/syslinux.cfg (filtered) =========================

DEFAULT loadconfig

LABEL loadconfig
  CONFIG /isolinux/isolinux.cfg
  APPEND /isolinux/

==================== sdb1: Location of files loaded by Grub ====================

           GiB - GB             File                                 Fragment(s)
            ?? = ??             boot/grub/grub.cfg                             1

================== sdb1: Location of files loaded by Syslinux ==================

           GiB - GB             File                                 Fragment(s)
            ?? = ??             syslinux.cfg                                   1
            ?? = ??             ldlinux.sys                                    1



Suggested repair: ______________________________________________________________

The default repair of the Boot-Repair utility would not act on the boot.