I wasn't at all surprised that wireless didn't work at first. A label under the computer says "Broadcom BCM94312MCG", and using ethernet and Synaptic I grabbed anything that looked relevant. It was downloaded and installed (I think);** but no change. I restarted the computer: still no change.
Right-clicking the ethernet (?) icon at the bottom right of the screen shows a check mark next to "Enable Networking". Left-clicking the same icon shows "Wired Network" and "VPN Connections" (not that there are any of the latter), but that's all.
The thread newbie needs help with wifi (broadcom BCM4311) is of course about the 4311 whereas I want the 4312, and I suppose it's about Ubuntu-based Mint, but it looks useful. Trouble is, I don't understand most of it and I'm reluctant to type stuff I don't understand at the command line. In what's currently the last message in the thread, somebody writes: I have a similar problem [...]. Read through the lengthy post. Would somebody please distill and list the commands necessary to be successful? I'll second that!
Anyway, I did type
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lspci -vvnn | grep Broadcom
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03:00:0 Network controller : Broadcom Corporation BCM4312 802.11b/g LP-PHY [14e4:4315] (rev 01)
*Almost a year ago I posted this thread about Mint on my then-new little HP notebook. That's now happily running CrunchBang, but I now want to do something useful with the machine that my HP largely replaced (one that doesn't like CrunchBang at all, quickily freezing after CrunchBang is booted live from a USB memory device, and freezing during the GRUB stage before CrunchBang can boot off the hard drive).
** No error message. But I'm told that 300+ recommended updates are available. I get them, install them, see no error message -- but then check to see that 300+ recommended updates are available. Ditto a third time....