After update, grub fail to access another partition

After update zorin, grub fail to access manjaro partition.

I have a /boot/efi/ folder. Now, after update zorin, it seems lost.

tree -d -l 1 /boot/
1 [error opening dir]
├── efi [error opening dir]
└── grub
    ├── fonts
    └── x86_64-efi

sudo update-grub have no effects.

Can you help me?

This thread might help?:

The folder appears in your tree, so it's not lost. The contents won't show, because only the owner (root) has the permission open it. (You need write (w) permission to open any directory). The owner and permissions on that folder:

drwx------ 3 root root      4096 Dec 31  1969 efi