Bug#876033: primusrun doesn't find libGL.so.1

[Luigi]

Package: primus
Version: 0~20150328-4
Severity: grave
Justification: renders package unusable

i installed primus, bumblebee and bumblebee-nvidia; i launched primusrun but i obtained this output:
$ primusrun glxgears -info
/usr/bin/primusrun: riga 41: attenzione: command substitution: ignored null byte in input
primus: fatal: failed to load any of the libraries: /usr/lib/x86_64-linux-gnu/nvidia/libGL.so.1:/usr/lib/i386-linux-gnu/nvidia/libGL.so.1:/usr/lib/nvidia/libGL.so.1
/usr/lib/x86_64-linux-gnu/nvidia/libGL.so.1: cannot open shared object file: No such file or directory
/usr/lib/i386-linux-gnu/nvidia/libGL.so.1: cannot open shared object file: No such file or directory
/usr/lib/nvidia/libGL.so.1: cannot open shared object file: No such file or directory

In my system libGL.so.1 is located in these directories:
~$ locate libGL.so.1
/etc/alternatives/glx--libGL.so.1-x86_64-linux-gnu
/usr/lib/mesa-diverted/x86_64-linux-gnu/libGL.so.1
/usr/lib/mesa-diverted/x86_64-linux-gnu/libGL.so.1.0.0
/usr/lib/x86_64-linux-gnu/libGL.so.1
/usr/lib/x86_64-linux-gnu/primus/libGL.so.1 


-- System Information:
Debian Release: buster/sid
  APT prefers unstable
  APT policy: (990, 'unstable'), (50, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 4.12.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=it_IT.UTF-8, LC_CTYPE=it_IT.UTF-8 (charmap=UTF-8), LANGUAGE= (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages primus depends on:
ii  bumblebee          3.2.1-16
ii  primus-libs        0~20150328-4
ii  socat              1.7.3.2-1
ii  xserver-xorg-core  2:1.19.3-2

Versions of packages primus recommends:
pn  primus-libs-ia32  <none>

primus suggests no packages.

-- no debconf information