mjhjmtu

I'm new here
I've been using Fedora about year , and my question is that , i have installed Fedora on Encrypted Hard Disk with LVM
and Here is my Volume Group

VG #PV #LV #SN Attr VSize VFree
fedora_unix 1 4 0 wz--n- 47.04g 4.00m

and my Logical Volumes are

 LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
 00 fedora_unix -wi-ao---- 5.00g 
 01 fedora_unix -wi-ao---- 5.00g 
 02 fedora_unix -wi-ao---- 3.82g 
 03 fedora_unix -wi-ao---- 33.21g 

and The Result Of The lsblk is

 NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
 sda 8:0 0 50G 0 disk 
 ├─sda1 8:1 0 976M 0 part /boot/efi
 ├─sda2 8:2 0 2G 0 part /boot
 └─sda3 8:3 0 47G 0 part 
 ├─fedora_unix-03 253:0 0 33.2G 0 lvm 
 │ └─luks-62a9d691-240c-49b9-b937-f611ef79b05c 253:2 0 33.2G 0 crypt /
 ├─fedora_unix-02 253:1 0 3.8G 0 lvm 
 │ └─luks-79810c34-a63d-43b6-80db-297d7982d66e 253:3 0 3.8G 0 crypt [SWAP]
 ├─fedora_unix-00 253:4 0 5G 0 lvm 
 │ └─luks-c49e658c-196a-4d07-8932-24e80fd36d79 253:7 0 5G 0 crypt /home
 └─fedora_unix-01 253:5 0 5G 0 lvm 
 └─luks-9e434ce7-2686-4f3f-9d55-b90224a1c290 253:6 0 5G 0 crypt /var

 sr0 11:0 1 55.3M 0 rom 

So How to define The root directory In grub > Minimal Bash ?

when i write

grub> ls

(hd0) (hd1) (hd1,gpt3) (hd1,gpt2) (hd1,gpt1) (lvm/fedora_unix-03)

(lvm/fedora_unix-02) (lvm/fedora_unix-01) (lvm/fedora_unix-00)


grub> set root=(hd1,gpt2)

grub> linuxefi /vmlinuz-4.17.2-200.fc28.x86_64 root=/dev/mapper/fedora_unix-03

grub> initrdefi /initramfs-4.17.2-200.fc28.x86_64.img

grub> boot

It does not boot , it just ask for the passpharse and after that the system could not switch to the real root file system

In Fact I can Boot an Encrypted Ubuntu , because the root file system is defined as

root=/dev/mapper/ubuntu--vg-root

But In My Case , In Fedora , I Tried

root=/dev/mapper/fedora_unix-root

It Does Not work

I also tried

root=/dev/mapper/fedora_unix-03

and it doest work also

Thanks In Advance

Sorry For My English

On my non-luks lvm setup with this schema

NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 978.1G 0 disk 
├─sda1 8:1 0 260M 0 part /boot/efi
└─sda2 8:2 0 977.9G 0 part 
 ├─vtb-Kali 253:0 0 50G 0 lvm /
 ├─vtb-Bunsen 253:1 0 10G 0 lvm 
 ├─vtb-Home 253:2 0 200G 0 lvm /home
 └─vtb-Work 253:3 0 300G 0 lvm /home/bu5hman/Documents/work

My GRUB boot sequence for those joyous occasions when the GRUB goes splat is

set root=(/lvm/vtb-Kali)
linux /vmlinuz root=/dev/mapper/vtb-Kali
initrd /initrd.img
boot

From this it seems you are pointing set root at the wrong partition.

Making a leap of faith to Fedora for setting the root to the / on your lvm and leaving fstab to pick up /boot/efi I would suggest you try

set root=(/lvm/fedora_unix-03)
linuxefi /vmlinuz-4.17.2-200.fc28.x86_64 root=/dev/mapper/fedora_unix-03
initrdefi /initramfs-4.17.2-200.fc28.x86_64.img
boot

If that doesn't work then try it without the leading / in set root

set root=(lvm/fedora_unix-03)

EDIT: after discussion in comments

try

`set root=` with either of the 2 options in my previous post.

After your call to linuxefi use

root=/dev/mapper/luks-d2c9decd-e486-4ef3-9146-654ca2b4ec0a