I am also facing the same issue. After adding sl-modem.conf file, supplied by Darik Horn has solved my problem. i have PCI SM56 Motorola chip-set base modem.
@ Darik Horn: I think udev rule will solve the problem for USB base modem. But what about PCI base modem? -- KERNEL=="slusb[0-9]*", GROUP="dialout", RUN+="/etc/init.d/sl-modem-daemon" -- -- no more /dev/ttySL0 device node https://bugs.launchpad.net/bugs/375148 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs