upgrade impossible

[Marco Righi]

It is not possible to perform the upgrade.

apt-get dist-upgrade

The following NEW packages will be installed:
  nvidia-opencl-icd-367
The following packages will be upgraded:
  nvidia-opencl-icd-361
1 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
4 not fully installed or removed.

Need to get 0 B/2833 kB of archives.
After this operation, 18.9 MB disk space will be freed.
Do you want to continue? [Y/n]
(Reading database ... 1097232 files and directories currently installed.)
Preparing to unpack .../nvidia-opencl-icd-361_367.44-0ubuntu0.16.04.1_amd64.deb ...
Failed to stop var-lib-snapd-lib-gl.mount: Unit var-lib-snapd-lib-gl.mount not loaded.
dpkg: warning: subprocess old pre-removal script returned error exit status 5
dpkg: trying script from the new package instead ...
dpkg: error processing archive /var/cache/apt/archives/nvidia-opencl-icd-361_367.44-0ubuntu0.16.04.1_amd64.deb (--unpack):
 there is no script in the new version of the package - giving up
Failed to get unit file state for var-lib-snapd-lib-gl.mount: No such file or directory
var-lib-snapd-lib-gl.mount is a disabled or a static unit, not starting it.
Selecting previously unselected package nvidia-opencl-icd-367.
dpkg: regarding .../nvidia-opencl-icd-367_367.44-0ubuntu0.16.04.1_amd64.deb containing nvidia-opencl-icd-367:
 nvidia-opencl-icd-367 conflicts with nvidia-opencl-icd
  nvidia-opencl-icd-361 provides nvidia-opencl-icd and is present and installed.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: nvidia-opencl-icd-361 361.45.11-0ubuntu0.16.04.1
ProcVersionSignature: Ubuntu 4.4.0-38.57-generic 4.4.19
Uname: Linux 4.4.0-38-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
Date: Mon Sep 12 10:07:20 2016
Dependencies:
 gcc-6-base 6.0.1-0ubuntu1
 libc6 2.23-0ubuntu3
 libgcc1 1:6.0.1-0ubuntu1
 ocl-icd-libopencl1 2.2.8-1
InstallationDate: Installed on 2016-04-28 (136 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: nvidia-graphics-drivers-361
UpgradeStatus: No upgrade log present (probably fresh install)