hello mkukri. yes i can post a install config here, but the vmware workstation pro is freely accessed product in case if you don't know, so you can easily reproduce this,i guess. and i think this maybe a different case after today's use in that configure. becasue i have see multiple entry in refind bootloader or grub2, any of them can lead me into system. just need manualy chosen one of them every bootup time. let's start with creat VM. everything is normal. ISO version is 24.04.5, processer num 2, 2 core per cpu. 16 GB RAM. bridge network. LSI logic I/O. 20GB SCSI driver. click create, add two scsi driver as big as before one. change firemware to UEFI. that's all about VM configure. then boot and select "Ubuntu Server with the HWE kernel", normally proceed until "storage configuration", select "custom storage layout". select sda as "Use as boot device",select sdb & sdc as "Add as another boot device". on every hard driver's free space, select "Add GPT Partition", chang format to "Leave unformatted".the move to "create" and hit enter. after everything is done, select "Create software RAID (md)". change RAID level to 5. use all 3 partitions. hit "create". select new created md0, hit "Add GPT Partition", hit "create". now we should have two path setted. the root "/", and "/boot/efi" which located on very first "bootdevice", i.e. sda. "available device " should has nothing left in it. then we hit "done" at very bottom part. then proceed to install system, wait till installer tell you to reboot. just reboot. we should get into Ubuntu smoothly, fresh installed system, everything looks fine. then we type reboot and hit enter. Boom. we get into GRUB rescure mode. if typeing "ls", onyl 6 items comming up as (proc) (memdisk) (md/0) (hd0) (hd0,gpt2) (hd0,gpt1). that's it. cyber magic.
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