[linux|Operation and maintenance] Deepin system efi boot loss solution

Causes of deepinsystem efiboot loss

Enter BOISto restore the settings to the default settings, the resulting linuxboot is lost, and windowsthe boot is normal.

Handling method

1. Use deepinthe system ISOin the boot disk creation tools make deepinthe system Udisk boot disk;
2. UStart with the disk, wait to enter the system installation interface, press the Ctrl+Alt+F1enter command and press the interface
3. Use efibootmgrcommands to view efistartup information

╰─$ efibootmgr 
BootCurrent: 0001
Timeout: 2 seconds
BootOrder: 0001,0000,0010,0011,0012,0013,0014,0018,0019,001A,001B,001C,001D,001E,001F,0020,0021
Boot0000* Windows Boot Manager
Boot0010  Setup
Boot0011  Boot Menu
Boot0012  Diagnostic Splash Screen
Boot0013  Lenovo Diagnostics
Boot0014  Regulatory Information
Boot0015  Startup Interrupt Menu
Boot0016  Rescue and Recovery
Boot0017  MEBx Hot Key
Boot0018* USB CD
Boot0019* USB FDD
Boot001A* NVMe0
Boot001B* NVMe1
Boot001C* ATA HDD0
Boot001D* ATA HDD1
Boot001E* USB HDD
Boot001F* PXE BOOT
Boot0020  Other CD
Boot0021  Other HDD
Boot0022* IDER BOOT CDROM
Boot0023* IDER BOOT Floppy
Boot0024* ATA HDD
Boot0025* ATAPI CD

4. Find the system startup file, each system will EFIcreate its own startup file in the partition.

╰─$ sudo fdisk -l
Disk /dev/nvme0n1: 477 GiB, 512110190592 bytes, 1000215216 sectors
Disk model: KXG6AZNV512G TOSHIBA                    
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 47E51627-924E-456B-9A6B-EBF1164A2625

Device             Start        End   Sectors   Size Type
/dev/nvme0n1p1      2048     534527    532480   260M EFI System #EFI 分区
/dev/nvme0n1p2    534528     567295     32768    16M Microsoft reserved
/dev/nvme0n1p3    567296  102873087 102305792  48.8G Microsoft basic data
/dev/nvme0n1p4 102873088  312588287 209715200   100G Microsoft basic data
/dev/nvme0n1p5 998166528 1000214527   2048000  1000M Windows recovery environment
/dev/nvme0n1p6 312588288  404246527  91658240  43.7G Linux filesystem
/dev/nvme0n1p7 404246528  998164479 593917952 283.2G Linux filesystem

Partition table entries are not in disk order.

5. Mount EFIpartition

sudo mount /dev/nvme0n1p1 /mnt/      #挂载EFI分区到/mnt目录

6. Enter the EFI partition

cd /mnt/EFI

7. View EFIthe contents of each directory

╰─$ ll *
Boot:
总用量 4.0M
-rwxr-xr-x 1 root root 1.2M Feb 28  2020 bootx64.efi
-rwxr-xr-x 1 root root 1.5M Feb 28  2020 bootx64.efi-1582906065.bak
-rwxr-xr-x 1 root root  117 Feb 28  2020 grub.cfg
-rwxr-xr-x 1 root root 1.1M Feb 28  2020 grubx64.efi
-rwxr-xr-x 1 root root 372K May 14  2015 LenovoBT.EFI
-rwxr-xr-x 1 root root 1.5K Jun 18  2012 License.txt
-rwxr-xr-x 1 root root   74 Aug  6  2012 ReadMe.txt

deepin:
总用量 3.4M
-rwxr-xr-x 1 root root  71K Aug 25 23:35 fbx64.efi
-rwxr-xr-x 1 root root  117 Aug 25 23:35 grub.cfg
-rwxr-xr-x 1 root root 1.1M Aug 25 23:35 grubx64.efi
-rwxr-xr-x 1 root root 1.2M Aug 25 23:35 mmx64.efi
-rwxr-xr-x 1 root root 1.2M Aug 25 23:35 shimx64.efi

Microsoft:
总用量 12K
drwxr-xr-x 40 root root 8.0K Apr  2  2019 Boot
drwxr-xr-x  2 root root 4.0K Apr  2  2019 Recovery

ubuntu:
总用量 1.1M
-rwxr-xr-x 1 root root  117 Feb 28  2020 grub.cfg
-rwxr-xr-x 1 root root 1.1M Feb 28  2020 grubx64.efi

8. Add Deepinstartup item

sudo efibootmgr -c -w -L "Deepin" -d /dev/nvme0n1p6 -p 1 -l \\EFI\\deepin\\grubx64.efi

Mine is Deepininstalled in/dev/nvme0n1p6

9. Command to delete startup items

sudo efibootmgr -b 0001 -B      #删除刚才添加的Deepin启动项，对应的编号为0001

Reference address Use efibootmgr to manage UEFI boot items and add missing boot items