The same error condition (no network devices found) sometimes occurs for me on a Dell Inspiron 600M after I disable and reenable NetworkManager by right-clicking nm-applet.
The network hardware is
02:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5702X Gigabit Ethernet (rev 02)
02:03.0 Network controller: Intel Corporation PRO/Wireless LAN 2100 3B Mini PCI Adapter (rev 04)
The same error condition (no network devices found) sometimes occurs for me on a Dell Inspiron 600M after I disable and reenable NetworkManager by right-clicking nm-applet.
The network hardware is
02:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5702X Gigabit Ethernet (rev 02)
02:03.0 Network controller: Intel Corporation PRO/Wireless LAN 2100 3B Mini PCI Adapter (rev 04)