At first I installed the package dropbear and lighttpd,then I installed
package vsftpd，I found the status of vsftpd service was crashed. Please
see the following figure.
however ,if I installed vsftpd without installing dropbear and lighttpd
in new VM ,the status of vsftpd service was started .Please see the
So, what happened !
(from redmine: issue id 9731, created on 2018-12-05)