Bug#747512: [grub-pc] Installation fails

[Philipp Klaus Krause]

Package: grub-pc
Version: 2.02~beta2-10
Severity: grave

--- Please enter the report below this line. ---

I cannot install current grub-pc. I first noticed the issue when trying
to update from synaptic, then apt.
Here's what happens when I try to install grub-pc using dpkg:

root at notebook4:~# LANG=C dpkg -i *.deb
(Reading database ... 315047 files and directories currently installed.)
Preparing to unpack grub-pc_2.02~beta2-10_amd64.deb ...
Unpacking grub-pc (2.02~beta2-10) over (2.02~beta2-10) ...
Preparing to unpack grub-pc-bin_2.02~beta2-10_amd64.deb ...
Unpacking grub-pc-bin (2.02~beta2-10) over (2.02~beta2-10) ...
Setting up grub-pc-bin (2.02~beta2-10) ...
Setting up grub-pc (2.02~beta2-10) ...
/var/lib/dpkg/info/grub-pc.postinst: line 195: /bin/uname: cannot
execute binary file: Exec format error
/var/lib/dpkg/info/grub-pc.postinst: line 195: /bin/uname: cannot
execute binary file: Exec format error
Installing for i386-pc platform.
Installation finished. No error reported.
Generating grub configuration file ...
/bin/uname: 1: /bin/uname: Syntax error: "(" unexpected
dpkg: error processing package grub-pc (--install):
 subprocess installed post-installation script returned error exit status 2
Processing triggers for man-db (2.6.7.1-1) ...
Errors were encountered while processing:
 grub-pc

--- System information. ---
Architecture: amd64
Kernel:

Debian Release: jessie/sid
  500 unstable        ftp.de.debian.org

--- Package information. ---
Depends                  (Version) | Installed
==================================-+-==================
debconf                  (>= 0.5)  | 1.5.53
 OR debconf-2.0                    |
grub-common      (= 2.02~beta2-10) | 2.02~beta2-10
grub2-common     (= 2.02~beta2-10) | 2.02~beta2-10
grub-pc-bin      (= 2.02~beta2-10) | 2.02~beta2-10
ucf                                | 3.0028


Package's Recommends field is empty.

Package's Suggests field is empty.


--- Output from package bug script ---

*********************** BEGIN /proc/mounts
/dev/mapper/universum-root / btrfs rw,relatime,ssd,discard,space_cache 0 0
/dev/sda1 /boot ext4 rw,relatime,discard,data=ordered 0 0
*********************** END /proc/mounts

*********************** BEGIN /boot/grub/grub.cfg
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
if [ -s /grubenv ]