Bug#1121934: cdrom: Target install partition fails to mount in EFI installer. Works in non-EFI installer

Control: reassign -1 partman-efi

On 04/12/2025 at 22:38, Daan Nusman wrote:
> 
> UEFI boot the USB stick, during "Partition Disks" the system says "The attempt to mount a fil system with type vfat in SCSI3 (0,0,0), partition #1 (sda) at /boot/efi failed".

It looks like the EFI partition was not formatted properly.

Which partitioning method did you use in both cases: manual/guided, 
using entire disk/largest free space, with LVM... ?

When the error happens, can you drop to an installer shell with 
Ctrl+Alt+F2 and report the output of the following commands:

anna-install fdisk-udeb
fdisk -l
blkid -s TYPE /dev/sda*
grep "format EFI" /var/log/partman