Ubuntu 8.04/Issues/Modem Does Not Work

From DellLinuxWiki

Description: The Conexant modem driver for Ubuntu 7.10 does not work on Ubuntu 8.04.
Systems Affected: Inspiron E1505n, 1420n, 1525n and XPS M1330n.
Impact: If you upgrade an Ubuntu 7.10 installation to Ubuntu 8.04, your modem will no longer work.
Fix: Uninstall old modem driver and install new one, which has been tested and qualified for Ubuntu 8.04:

E1505n, 1420n and 1525n

1. Remove old modem driver by following instructions here.
2. Update Dell's PPA entry in /etc/apt/sources.list as detailed here so you can install an updated linux-ubuntu-modules package, otherwise the installation of the driver in the next step will fail.
3. Download new driver hsfmodem_7.68.00.09oem_i386.deb and install it:

$ sudo dpkg -i hsfmodem_7.68.00.09oem_i386.deb

4. Reboot.

This new driver is also available in rpm format and tarball here. These packages were not tested or qualified and are provided as-is.

XPS M1330n

1. Remove old driver:

$ sudo dpkg -r dgcmodem
$ sudo dpkg -r linux-backports-modules-2.6.22-14-generic
$ sudo reboot

2. Update Dell's PPA entry in /etc/apt/sources.list as detailed here so you can install an updated linux-ubuntu-modules package, otherwise the installation of the driver in the next step will fail.
3. Download new driver dgcmodem_1.04_i386.deb and install it:

$ sudo dpkg -i dgcmodem_1.04_i386.deb

4. Reboot.

This new driver is also available in rpm format and tarball here. These packages were not tested or qualified and are provided as-is.