Yakkety:
% groups
rharper adm cdrom sudo dip plugdev lxd libvirtd lpadmin sambashare
% ls -al /usr/bin/qemu-system-x86_64 /dev/kvm
crw-rw----+ 1 root kvm 10, 232 May 18 14:56 /dev/kvm
-rwxr-xr-x 1 root root 9037256 May 19 20:06 /usr/bin/qemu-system-x86_64*
% dpkg --list | grep qemu
ii ipxe-qemu 1.0.0+git-20150424.a25a16d-1ubuntu2 all PXE boot firmware - ROM images for qemu
ii qemu-block-extra:amd64 1:2.6+dfsg-1ubuntu1 amd64 extra block backend modules for qemu-system and qemu-utils
ii qemu-kvm 1:2.6+dfsg-1ubuntu1 amd64 QEMU Full virtualization
ii qemu-system-common 1:2.6+dfsg-1ubuntu1 amd64 QEMU full system emulation binaries (common files)
ii qemu-system-x86 1:2.6+dfsg-1ubuntu1 amd64 QEMU full system emulation binaries (x86)
ii qemu-utils 1:2.6+dfsg-1ubuntu1 amd64 QEMU utilities
% qemu-system-x86_64 -nographic -enable-kvm -hda /dev/null
Could not access KVM kernel module: Permission denied
failed to initialize KVM: Permission denied
Xenial (same command runs fine)
% groups
rharper adm cdrom sudo dip plugdev lpadmin sambashare lxd sbuild libvirtd
% ls -al /usr/bin/qemu-system-x86_64 /dev/kvm
crw-rw----+ 1 root kvm 10, 232 Jun 14 11:17 /dev/kvm
-rwxr-xr-x 1 root root 8410368 May 11 06:47 /usr/bin/qemu-system-x86_64*
% dpkg --list | grep qemu
ii ipxe-qemu 1.0.0+git-20150424.a25a16d-1ubuntu1 all PXE boot firmware - ROM images for qemu
ii qemu-block-extra:amd64 1:2.5+dfsg-5ubuntu10.1 amd64 extra block backend modules for qemu-system and qemu-utils
ii qemu-kvm 1:2.5+dfsg-5ubuntu10.1 amd64 QEMU Full virtualization
ii qemu-system-common 1:2.5+dfsg-5ubuntu10.1 amd64 QEMU full system emulation binaries (common files)
ii qemu-system-x86 1:2.5+dfsg-5ubuntu10.1 amd64 QEMU full system emulation binaries (x86)
ii qemu-utils 1:2.5+dfsg-5ubuntu10.1 amd64 QEMU utilities