doc: add "chrony" to preflight checklist for Ubuntu 18.04

This commit updates the "Install NTP" section of the preflight
checklist, instructing readers who are using Ubuntu 18.04 to
use the package name "chrony" where elsewhere the package name
"ntp" would be used. "chrony" has replaced "ntp" in Ubnutu 18.04.

This commit fixes Bug number 8 in the list here:
https://pad.ceph.com/p/Report_Documentation_Bugs

Signed-off-by: Zac Dover <zac.dover@gmail.com>

diff --git a/doc/start/quick-start-preflight.rst b/doc/start/quick-start-preflight.rst
index bfb7b85650b256b6e0c8932b5509df1c55082c7b..d9ae12895ca78782c6df33690a1ba622fe8dd535 100644 (file)
--- a/doc/start/quick-start-preflight.rst
+++ b/doc/start/quick-start-preflight.rst
@@ -122,7 +122,11 @@ On CentOS / RHEL, execute::
 
 On Debian / Ubuntu, execute::
 
-       sudo apt install ntp
+       sudo apt install ntpsec 
+
+or::
+
+       sudo apt install chrony 
 
 Ensure that you enable the NTP service. Ensure that each Ceph Node uses the
 same NTP time server. See `NTP`_ for details.