LMDE5 can't deal with wifi Broadcom

[NoHo Hank]

Dualboot on old Dell laptop. On LM21 xfce wifi is working. On LMDE5 it is not, it just isn't able to connect.
Both OS work on wire.
Tried:

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mint@mint:~$ iwconfig
lo        no wireless extensions.
enp9s0    no wireless extensions.
wlp12s0   IEEE 802.11  ESSID:xxx  
          Mode:Managed  Frequency:2.437 GHz  Access Point: D4:3D:F3:C2:04:1D   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:on       
mint@mint:~$ 

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mint@mint:~$ lspci -nn -d 14e4:
0c:00.0 Network controller [0280]: Broadcom Inc. and subsidiaries BCM4312 802.11b/g LP-PHY [14e4:4315] (rev 01)
mint@mint:~$ 

[JeremyB]

Any result on LMDE for

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dmesg | egrep -i 'b43|firm'

I am not sure how LMDE handles installing the Broadcom firmware that the b43 driver needs and if you are booting the ISO it makes the firmware issue a bit difficult as a few drivers need to be unloaded and reloaded after firmware is installed

[NoHo Hank]

result on LMDE for

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dmesg | egrep -i 'b43|firm'

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x@y:~$ dmesg | egrep -i 'b43|firm'
[    0.615003] ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored
[    0.737707] acpi PNP0A03:00: [Firmware Info]: MMCONFIG for domain 0000 [bus 00-3f] only partially covers this bridge
[    3.052245] [Firmware Bug]: Duplicate ACPI video bus devices for the same VGA controller, please try module parameter "video.allow_duplicates=1"if the current driver doesn't work.
[    3.418491] radeon 0000:01:00.0: firmware: direct-loading firmware radeon/RV710_pfp.bin
[    3.418527] radeon 0000:01:00.0: firmware: direct-loading firmware radeon/RV710_me.bin
[    3.418549] radeon 0000:01:00.0: firmware: direct-loading firmware radeon/R700_rlc.bin
[    3.418581] radeon 0000:01:00.0: firmware: direct-loading firmware radeon/RV710_smc.bin
[    3.420897] radeon 0000:01:00.0: firmware: direct-loading firmware radeon/RV710_uvd.bin
[    9.202336] platform regulatory.0: firmware: direct-loading firmware regulatory.db
[    9.203073] platform regulatory.0: firmware: direct-loading firmware regulatory.db.p7s
x@y:~$ 

[jwiz]

sudo apt install firmware-b43-installer

[MiZoG]

Relevant Debian wiki entries:

bcm43xx

wl - non-free driver <-- non-free software sources, kernel headers etc are all configured/installed by default in LMDE so dismiss those parts.

[NoHo Hank]

sudo apt install firmware-b43-installer

Sadly it doesn't change a thing. No wifi signal is received. Normally there are at least 10 wifi signals shown.

[jwiz]

Try a sudo dpkg-reconfigure firmware-b43-installer and see what it gets you.

[Hawaiihemd]

With my system I had to remove a blacklisting to get the broadcom WiFi to work. I'm not at the machine right now so I can not check which file I edited, maybe it was /etc/modprobe.d/blacklist.conf but I'm not sure.
I could check later today if needed.

Edit:
Out of curiosity I checked anyway.
For my bcm4311 WiFi card I commented-out the line blacklist b43 in the file /etc/modprobe.d/broadcom-sta-dkms.conf.
Maybe with your setup it is similar...