Tell the user to use ubuntu. (#2109) #1517

Job	Run time
configure-updates (configure-updates, no-unattended-updates)	7m 45s
configure-updates (configure-updates, default)	6m 9s
restart-services (restart-services, default)	10m 36s
setup (setup, default)	8m 38s
switch-repos (switch-repos, default)	9m 54s
update-changes (update-changes, 215)	6m 52s
update-changes (update-changes, 221)	6m 8s
update-changes (update-changes, 222)	6m 6s
update-changes (update-changes, 223)	6m 45s
update-package (update-package, default)	7m 32s
upgrade-prep (upgrade-prep, default)	10m 2s
manage-service (manage-service, start-stop)	8m 48s
manage-service (manage-service, notifications)	10m 31s
manage-service (manage-service, write-start)	9m 27s
manage-service (manage-service, start)	8m 14s
manage-service (manage-service, start-multiple)	7m 59s
update-services (update-services, single-service)	8m 46s
update-services (update-services, default)	8m 10s
ssv-key-generator (ssv-key-generator, default)	8m 34s
update-stereum (update-stereum, default)	8m 12s
update-stereum (update-stereum, override)	9m 15s
update-stereum (update-stereum, full)	11m 11s
	3h 5m 34s

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