Starý disk na novém motherboardu nebootuje, protože umí jen UEFI.


Disk /dev/sda 
Number  Start (sector)    End (sector)  Size       Code  Name
   1            2048         1026047   500.0 MiB   8300  Linux filesystem
   2         1026048        11511807   5.0 GiB     8200  Linux swap
   3        11511808       468658175   218.0 GiB   8300  Linux filesystem

Pomoci gdisk /dev/sda ktery se jen spusti a pak "w" ulozi GPT

Pokud se objevi nasledujici chyba:
  Warning! Secondary partition table overlaps the last partition by 33 blocks!
  You will need to delete this partition or resize it in another utility.

tak opravit bootnutim do boot-repair-disk-64bit.iso

a potom

  [root@barka ~]# gdisk /dev/sda
  GPT fdisk (gdisk) version 1.0.9
  
  Partition table scan:
  MBR: MBR only
  BSD: not present
  APM: not present
  GPT: not present
  
  
  ***************************************************************
  Found invalid GPT and valid MBR; converting MBR to GPT format
  in memory. THIS OPERATION IS POTENTIALLY DESTRUCTIVE! Exit by
  typing 'q' if you don't want to convert your MBR partitions
  to GPT format!
  ***************************************************************
  
  
  Command (? for help): w
  
  Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
  PARTITIONS!!
  
  Do you want to proceed? (Y/N): Y
  OK; writing new GUID partition table (GPT) to /dev/sda.
  Warning: The kernel is still using the old partition table.
  The new table will be used at the next reboot or after you
  run partprobe(8) or kpartx(8)
  The operation has completed successfully.
  
  
Vysledek je GPT disk
  
Pak zmenit EF00 pro prvni partition v pomoci gdisk /dev/sda
  
Nasledne vytvorit fat filesystem na sda1   mkfs.fat /dev/sda1

Instalovat grub2 stale nejde:
  [root@barka ~]# grub2-install /dev/sda
  Installing for i386-pc platform.
  grub2-install: warning: ../grub-core/partmap/gpt.c:194:this GPT partition label contains no BIOS Boot Partition; embedding won't be possible.
  grub2-install: warning: Embedding is not possible.  GRUB can only be installed in this setup by using blocklists.  However, blocklists are UNRELIABLE and their use is 
  discouraged..
  grub2-install: error: will not proceed with blocklists.
  
Ale to se opravi pomoci parted /dev/sda

  parted /dev/sda
  set 1 boot off
  set 1 bios_grub on
  q

Pak uz jde grub2-install /dev/sda

  [root@barka ~]# grub2-install /dev/sda
  Installing for i386-pc platform.
  Installation finished. No error reported.