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I've just been upgrading my oldest machine, a Lenovo N500, and here is
another interesting feature of the wireless driver landscape. Whereas
the Compaq machine seemed to find the wireless driver already on board,
and installed it automatically, the Lenovo machine lost the necessary
driver it already had, during the upgrade, and had to be connected with
a network cable after upgrade from the USB stick, so that it could find
the necessary driver (Broadcom) in bcmwl-kernel-source (proprietory). In
this case I had to go to Software and Updates Additional Drivers tab to
OK it. But there are a range of possibilities here: maybe in some cases
it will find online, download and install automatically, given the
temporary connection via the network cable. So even if you have a
machine which is wireless capable before the upgrade, you might need to
switch to network cable during the upgrade.
