I too lost Wi-Fi after doing apt upgrade, which brought the kernel to 5.8.0.34-generic. Same "ioremap_cache" reported as above.
I found that the package for the broadcom in my Macbook Pro should be using firmware-b43-installer, not the bcmwl-kernel-source package, according to the "BROADCOM WIRELESS TABLE (Updated Oct 29, 2020)" table in this AskUbuntu answer: https://askubuntu.com/a/60395/157287 $ lspci -nn -d 14e4: |grep Network 03:00.0 Network controller [0280]: Broadcom Inc. and subsidiaries BCM4331 802.11a/b/g/n [14e4:4331] (rev 02) When I look up 14e4:4331 under the Ubuntu 20.04+ column, it says, for package name: firmware-b43-installer / linux-firmware So then I removed bcmwl-kernel-source: $ sudo apt-get purge bcmwl-kernel-source And then plugged in a USB Wi-Fi adapter and installed firmware-b43-installer (linux-firmware was already installed): $ sudo apt install firmware-b43-installer Rebooted, and was back in business! (albeit for 2.4 GHz only, not 5 GHz) Unfortunately, I wasn't so lucky with an old Lenovo E431 that had the same issue ("ioremap_cache"). $ lspci -nn -d 14e4: 04:00.0 Network controller [0280]: Broadcom Inc. and subsidiaries BCM43142 802.11b/g/n [14e4:4365] (rev 01) Which, in that table shows also to use firmware-b43-installer. But that's unrelated to this bcmwl bug, so I'll not pursue that here. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1907445 Title: bcmwl-kernel-source 6.30.223.271+bdcom-0ubuntu5: bcmwl kernel module failed to build To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/bcmwl/+bug/1907445/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
