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Bug#840400: debian-installer: Installation fails at Partitioning on EFI with vfat filesystem

Package: debian-installer
Severity: important

Debian testing installation (From DVD-1) fails at Partitioning:

The following error is reported:

The attempt to mount a file system with type vfat in SCSI1(0, 0, 0), partition #2 (sda) at /boot/efi failed.

You may resume partitioning from the partitioning menu.
Do you want to resume partitioning?
<Go Back>                               <Yes>  <No>

(Above log may contain typos, sorry.)

If I select <No> Installer yells at me saying "An installation step failed...." and Aborts.

When I try to mount /dev/sda2 manually (mount /dev/sda2 /mnt). It says "... failed. Invalid argument".
/dev/sda2 is shown as 'EFI System Partition' in Partition lists of the installer.

So probably the vfat module for mount is missing (or not loaded by default) in installer, which should be.

The system is booted with EFI mode enabled (and secure boot disabled).

-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 4.7.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_IN, LC_CTYPE=en_IN (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

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