ubuntu@autopkgtest:~$ cat /lib/systemd/system/lxcfs.service 
[Unit]
Description=FUSE filesystem for LXC
ConditionVirtualization=!container
Before=lxc.service
Requires=cgmanager.service
After=cgmanager.service

[Service]
ExecStart=/usr/bin/lxcfs -f -s -o allow_other /var/lib/lxcfs/
Restart=on-failure

[Install]
WantedBy=multi-user.target