lspci | grep -i network
03:00.0 Network controller: Broadcom Inc. and subsidiaries BCM4322
802.11a/b/g/n Wireless LAN Controller (rev 01)
SOLUTION
sudo apt-get purge bcmwl-kernel-source
sudo apt-get install broadcom-sta-source broadcom-sta-dkms
broadcom-sta-common
reboot
now wifi is OK
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https://bugs.launchpad.net/bugs/1906745
Title:
bcmwl-kernel-source 6.30.223.271+bdcom-0ubuntu5: bcmwl kernel module
failed to build
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