[SOLVED] Stuck on "Welcome to GRUB" after update

do you have that problem here
 
do you have that problem here
No I haven’t gotten that error
 
You have not replied & I am about to finish my day. So basically in the lsblk output you should find one of the partitions mounted on /boot/efi
Let's call that partition <p2> (I don't know what it is, so replace it with whatever name it actually has).

So lets try correcting that ESP sync. for that partition, with the following:

Code:
umount /boot/efi

proxmox-boot-tool init /dev/<p2>   #replace <p2> with whatever you have eg: /dev/sda2 or maybe /dev/nvme0n1p2 etc.
Reboot.
This fixed my install.

Thanks.