For me it does NOT work with 6.8.

I didn't get any errors when I installed the 6.8 kernel:

$ apt-cache policy linux-image-generic
linux-image-generic:
  Installed: (none)
  Candidate: 6.8.0-138.138
...
$ sudo apt install linux-image-6.8.0-138-generic linux-headers-6.8.0-138-generic
...
Building module:
Cleaning build area...
make -j4 KERNELRELEASE=6.8.0-138-generic KVER=6.8.0-138-generic.....
Signing module /var/lib/dkms/broadcom-sta/6.30.223.271/build/wl.ko
Cleaning build area...

wl.ko.zst:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/6.8.0-138-generic/updates/dkms/
depmod...
...
dkms autoinstall on 6.8.0-138-generic/x86_64 succeeded for broadcom-sta nvidia
 * dkms: autoinstall for kernel 6.8.0-138-generic
   ...done.
------------------------------------------------------------------------

At this point I expected the new driver package in proposed to work with
the 6.8 kernel. But after rebooting to this 6.8 kernel I could not
connect to WiFi:

$ uname -r
6.8.0-138-generic
$ dkms status | grep broadcom
broadcom-sta/6.30.223.271, 6.17.0-40-generic, x86_64: installed
broadcom-sta/6.30.223.271, 6.8.0-138-generic, x86_64: installed
broadcom-sta/6.30.223.271, 7.0.0-28-generic, x86_64: installed
broadcom-sta/6.30.223.271, 7.0.0-30-generic, x86_64: installed
$ lsmod | grep wl
<nothing>
$ modprobe wl
modprobe: ERROR: could not insert 'wl': Unknown symbol in module, or unknown 
parameter (see dmesg)
$ dmesg | grep -i wl
[   26.105191] wl: loading out-of-tree module taints kernel.
[   26.105199] wl: module license 'MIXED/Proprietary' taints kernel.
[   26.105203] wl: module verification failed: signature and/or required key 
missing - tainting kernel
[   26.105204] wl: module license taints kernel.
[   26.105241] wl: Unknown symbol cfg80211_inform_bss_frame_data (err -2)
[   26.105269] wl: Unknown symbol cfg80211_scan_done (err -2)
[   26.105307] wl: Unknown symbol cfg80211_disconnected (err -2)
[   26.105325] wl: Unknown symbol wiphy_new_nm (err -2)
[   26.105343] wl: Unknown symbol wiphy_register (err -2)
[   26.105349] wl: Unknown symbol cfg80211_put_bss (err -2)
[   26.105352] wl: Unknown symbol cfg80211_roamed (err -2)
[   26.105356] wl: Unknown symbol cfg80211_gtk_rekey_notify (err -2)
[   26.105361] wl: Unknown symbol ieee80211_get_channel_khz (err -2)
[   26.105368] wl: Unknown symbol cfg80211_ibss_joined (err -2)
[   26.105379] wl: Unknown symbol cfg80211_michael_mic_failure (err -2)
[   26.105391] wl: Unknown symbol wiphy_unregister (err -2)
[   26.105405] wl: Unknown symbol ieee80211_freq_khz_to_channel (err -2)
[   26.105439] wl: Unknown symbol ieee80211_channel_to_freq_khz (err -2)
[   26.105446] wl: Unknown symbol cfg80211_report_wowlan_wakeup (err -2)
[   26.105454] wl: Unknown symbol cfg80211_inform_bss_data (err -2)
[   26.105468] wl: Unknown symbol cfg80211_connect_done (err -2)
[   26.105472] wl: Unknown symbol __cfg80211_get_bss (err -2)
[   26.105475] wl: Unknown symbol wiphy_free (err -2)
------------------------------------------------------------------------


Possibly relevant: my graphical environment didn't come on either. I collected 
these outputs from a tty console. My Nvidia drivers may be suffering from the 
same issue.

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https://bugs.launchpad.net/bugs/2161038

Title:
  broadcom-sta-dkms fails to build with kernel 7.0 HWE

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