Как работает lubuntu? [закрыто]

Из страниц pppd man:

   debug  Enables  connection  debugging  facilities.   If  this option is
          given, pppd will log the contents of all control packets sent or
          received  in  a  readable  form.  The packets are logged through
          syslog with facility daemon and level debug.   This  information
          can  be  directed  to  a  file  by  setting  up /etc/syslog.conf
          appropriately (see syslog.conf(5)).

Итак, по умолчанию все журналы pppd будут перенаправлены на /var/log/syslog.