Comment 2 for bug 1921013

This potentially looks like a bug:

root@myhost:/var/snap/microstack/current/snap-openstack# ls -l
total 1
-rw-r--r-- 1 root root 0 Mar 23 20:35 setup.lock
root@mad19:/var/snap/microstack/current/snap-openstack# at setup.lock

Command 'at' not found, but can be installed with:

apt install at

root@myhost:/var/snap/microstack/current/snap-openstack

Clearly I don't use `at` much and so did not have it installed.