Here is the wifi options at ThinkPenguin:
https://www.thinkpenguin.com/catalog/wireless-networking-gnulinux
For a Dell Latitude D620, I would assume you would need either the
'Penguin Wireless N Mini PCI for GNU / Linux' or the 'Penguin Wireless N PCI
Card for GNU / Linux v5 /w Low Profile Bracket' but check inside for the
size.
I am assuming it's one of those considering the age of the laptop.
The other option is, like stated above, to go with a usb dongle type.
I have a Dell Latitude 6430u that I put one of these cards in and it works
wonderfully.
Peace to you,
grimlok
