This is the info I have but I don't know where to go from here:
richardabuli@richardabuli-XPS-15-9530:~$ lspci -knn | grep Net –A2 06:00.0 Network controller : Broadcom Corporation BCM4352 802.11ac Wireless Network Adapter [14e4:43b1] (rev 03) Subsystem: Dell BCM4352 802.11ac Wireless Network Adapter [1028:0019] Kernel modules: bcma, wl 07:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5249 PCI Express Card Reader [10ec:5249] (rev 01) richardabuli@richardabuli-XPS-15-9530:~$ lspci | egrep -i 'network|ethernet' 06:00.0 Network controller: Broadcom Corporation BCM4352 802.11ac Wireless Network Adapter (rev 03) richardabuli@richardabuli-XPS-15-9530:~$
By "lost internet" I mean that when I click on the internet icon (which is now an empty circular sector with no sign of any activity) on the right top of the ubuntu screen I get the following list: No network devices available (in grey)
VPN connections Enable networking Connection information (in grey) Edit connections
When I click on 'Enable networking" I get the message "Disconnected - you are now offline" When I click on "Edit connections" I find my old list of Ethernet and Wifi connections with the indications that they have last used a few days ago (just before the upgrading to 16.04 -- by the way I updated first from 14 to 15 and then from 15 to 16, internet worked with 15) When I click in any of the connections a window opens with the information for the connection which to me looks OK.