I followed the tutorials on internet, which told me if I can't boot my ubuntu appropriately(coz I changed my motherboard, the boot-loader has been overwritten), I need to use a bootable usb and use the boot-repair app. But during my using, I only found one button in the interface of boot-repair. I clicked it, and it doesn't work. This picture is what I see.
And this is the log:
boot-repair-4ppa161 [20220116_1255]
============================== Boot Info Summary ===============================
=> Syslinux MBR (5.00 and higher) is installed in the MBR of /dev/sda.
sda1: __________________________________________________________________________
File system: vfat
Boot sector type: SYSLINUX 6.04
Boot sector info: Syslinux looks at sector 32832 of /dev/sda1 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 /efi/BOOT/mmx64.efi /ldlinux.sys
================================ 0 OS detected =================================
================================ Host/Hardware =================================
CPU architecture: 64-bit Video: UHDGraphics620 from Intel Corporation Live-session OS is Ubuntu 64-bit (Ubuntu 20.04.1 LTS, focal, x86_64)
===================================== UEFI =====================================
BIOS is EFI-compatible, and is setup in EFI-mode for this live-session. SecureBoot disabled.
efibootmgr -v BootCurrent: 0005 Timeout: 0 seconds BootOrder: 0000,0001,0002,0003,0004,0005 Boot0000* Windows Boot Manager HD(1,GPT,9434477c-03d0-44b9-b6ef-0032f536cf5c,0x800,0x145000)/File(\EFI\Microsoft\Boot\bootmgfw.efi)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.}...8................ Boot0001* Diskette Drive BBS(Floppy,Diskette Drive,0x0)..BO Boot0002* USB Storage Device BBS(USB,KingstonDataTraveler 3.0PMAP,0x0)..BO Boot0003* CD/DVD/CD-RW Drive BBS(CDROM,CD/DVD/CD-RW Drive,0x0)..BO Boot0004* Onboard NIC BBS(Network,IBA CL Slot 00FE v0112,0x0)..BO Boot0005* UEFI: KingstonDataTraveler 3.0PMAP, Partition 1 PciRoot(0x0)/Pci(0x14,0x0)/USB(17,0)/HD(1,MBR,0xab7f6a6,0x800,0x39bf800)..BO
============================= Drive/Partition Info =============================
Disks info: ____________________________________________________________________
Partitions info (1/3): _________________________________________________________
Partitions info (2/3): _________________________________________________________
Partitions info (3/3): _________________________________________________________
fdisk -l (filtered): ___________________________________________________________
Disk sda: 28.9 GiB, 31004295168 bytes, 60555264 sectors Disk identifier: 0x0ab7f6a6 Boot Start End Sectors Size Id Type sda1 * 2048 60555263 60553216 28.9G c W95 FAT32 (LBA)
parted -lm (filtered): _________________________________________________________
sda:31.0GB:scsi:512:512:msdos:Kingston DataTraveler 3.0:; 1:1049kB:31.0GB:31.0GB:fat32::boot, lba;
Free space (filtered): _________________________________________________________
sda:29568MiB:scsi:512:512:msdos:Kingston DataTraveler 3.0:; 1:0.03MiB:1.00MiB:0.97MiB:free;
blkid (filtered): ______________________________________________________________
NAME FSTYPE UUID PARTUUID LABEL PARTLABEL
sda
└─sda1 vfat 4091-A721 0ab7f6a6-01 UBUNTU 20_0
df (filtered): _________________________________________________________________
Avail Use% Mounted on
sda1 26.3G 9% /cdrom
Mount options: __________________________________________________________________
sda1 ro,noatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro
====================== sda1/boot/grub/grub.cfg (filtered) ======================
Ubuntu Ubuntu (safe graphics) OEM install (for manufacturers) Boot from next volume UEFI Firmware Settings
========================= sda1/syslinux.cfg (filtered) =========================
DEFAULT loadconfig
LABEL loadconfig CONFIG /isolinux/isolinux.cfg APPEND /isolinux/
==================== sda1: Location of files loaded by Grub ====================
GiB - GB File Fragment(s)
?? = ?? boot/grub/grub.cfg 1
================== sda1: 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.
