Trouble running sudo or (less ) after After making serial settings

[Eugene Grosbein]

31.01.2018 19:21, ali reza zareian пишет:
>  hello
> After making serial settings and boot using serial via putty, it is not
> possible to run sudo command.when i run this command without any parameters
> it should be print help but it is waiting for a key of the keyboard.
> if i send ctrl+c then output strings are printed.

You may be having flow control problem with /dev/console
mentioned in default /etc/syslog.conf as target to auth.notice messages
generated by sudo. Try to comment that line out and do "killall -1 syslogd".