Comment 8 for bug 22119

According to syslog and settings in /etc/ppp/peers/* a device /dev/modem is assumed which does not exist. Instead, the real device name should be added (e.g. /dev/ttySL0 for smartlink-alsa-driver, /dev/slamr0 for non-free driver, /dev/ttyS0 for serial modem etc.) . Udev no-longer creates a /dev/modem link as far as I know. Only for "ttyLTM[0-9]*" (whatever kind of device that is, maybe lucent?) in /etc/udev/rules.d/60-symlinks.rules a symlink is set up. You may modify this setting according to your needs, too, if you want to have a /dev/modem symlink (which is still hardcoded for some programs).