I have installed Ubuntu 18.04 installed natively, and everytime I reboot the system from command line using,
reboot
or
shutdown -r now
the default port for SSH is closed. To remediate that, I have to physically force reboot the system. This has never happened, so I cannot make any sense of that.
Update
Running shutdown & then physically turning on works,
shutdown -h now
journalctl /usr/sbin/sshd
will show yousshd
log messages back to the Beginning-Of-Time.journalctl -b 0 /usr/sbin/sshd
will show the current boot's messages,journalctl -b -1 /usr/sbin/sshd
the previous,etc.journalctl --list-boots
is handy, too. – waltinator Aug 18 '19 at 22:01