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WARNING: The AC adapter type cannot be determined. This will prevent optimal system performance. Please check AC adapter connect properly, remove AC adapter and plug-in it again, thanks.
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$sudo lspci -v 05:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01) Subsystem: Dell Wireless 1395 WLAN Mini-Card
# Debian 11 "bullseye" deb http://deb.debian.org/debian bullseye main contrib non-free
$ sudo apt-get update $ sudo apt-get install linux-image-$(uname -r|sed 's,[^-]*-[^-]*-,,') linux-headers-$(uname -r|sed 's,[^-]*-[^-]*-,,') broadcom-sta-dkms
$ sudo apt-get update $ sudo apt-get install firmware-b43-installer
$ sudo apt-get update #To Install b43 driver $ sudo apt-get install bcmwl-kernel-source #To Install b43-legacy driver $ sudo apt-get install b43-fwcutter
$ sudo apt-get update $ sudo apt-get install bcmwl-kernel-source