EndeavourOS attempting to mount wrong disk on boot

General system Newbie
1

I installed EndeavourOS on an SSD in my laptop alongside Fedora linux, with Windows 11 on another SSD, and I have grub2 on Fedora as my bootloader. 50% of the time, it attempts to mount nvme0n1p4 (NTFS windows partition) instead of nvme1n1p4 (ext4 EndeavourOS partition) on boot. When this happens, I can reboot and it will work properly. Here is my fdisk:

Disk /dev/nvme0n1: 953.87 GiB, 1024209543168 bytes, 2000409264 sectors
Disk model: INTEL SSDPEKNU010TZ                     
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: 6198EBDB-7932-4E5B-A355-7CE514E9F5E5

Device              Start        End    Sectors   Size Type
/dev/nvme0n1p1       2048     534527     532480   260M EFI System
/dev/nvme0n1p2     534528     567295      32768    16M Microsoft reserved
/dev/nvme0n1p3     567296 1951967886 1951400591 930.5G Microsoft basic data
/dev/nvme0n1p4 1951969280 1953857535    1888256   922M Windows recovery environment
/dev/nvme0n1p5 1953861632 1999998975   46137344    22G Microsoft basic data
/dev/nvme0n1p6 1999998976 2000408575     409600   200M Windows recovery environment


Disk /dev/nvme1n1: 931.51 GiB, 1000204886016 bytes, 1953525168 sectors
Disk model: Samsung SSD 980 PRO 1TB                 
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: B65920ED-3BA6-4CA7-9783-0369FFCE723B

Device              Start        End    Sectors   Size Type
/dev/nvme1n1p1       2048    1230847    1228800   600M EFI System
/dev/nvme1n1p2    1230848    3327999    2097152     1G Linux filesystem
/dev/nvme1n1p3    3328000 1009805311 1006477312 479.9G Linux filesystem
/dev/nvme1n1p4 1009805312 1953525134  943719823   450G Linux filesystem

Is this an issue with grub, and are there steps I can take to fix this?

2

Here is the mount error

3

You say mount but I think you mean it attempts to boot Windows instead of grub showing up with a menu to boot any of the three OS’s? First check in UEFI Bios settings that the drive set to boot is EndeavourOS not Windows. I’m assuming you are using EOS to boot from which when it boots should always bring up the grub menu in which you select an OS to boot.

4

Check the image. It boots EndeavourOS, which attempts to mount the wrong SSD and fails to boot, falling back to emergency shell. Also my grub is on Fedora, which is installed on the same drive as EOS.

5

I would switch to booting from EOS grub instead of Fedora.