解决方法:将ttyS0.conf改为如下内容：
linux@linux:~$ cat /etc/init/ttyS0.conf
# ttyS- getty
#
# This service maintains a getty on tty1 from the point the system is
# started until it is shut down again.
start on stopped rc RUNLEVEL=[2345] and (
not-container or
container CONTAINER=lxc or
container CONTAINER=lxc-libvirt)
stop on runlevel [!2345]
respawn
exec /sbin/getty -L 115200 ttyS0 vt100
linux@linux:~$
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