I have a rather old (I think it’s from the year 2010) “HP Pavilion dv6” laptop computer, that is running “Xubuntu 24.04.4 LTS (Noble Numbat)” and I faced this same problem. I ended up solving this in a way that is rather similar to @ogra’s suggestion (by enabling first the “Pre-released updates (noble-proposed)” checkbox in the “Developer options” tab of “Software & Updates”), BUT I had to then install the “broadcom-sta-dkms/noble-proposed” software package instead of “broadcom-sta/noble-proposed” because - as it happened to you - I also got the “E: Unable to locate package broadcom-sta” error message when doing “sudo apt install broadcom-sta/noble-proposed”.
So, the command that worked for me (after having enabled the “Pre-released updates (noble-proposed)” was the following:
sudo apt install broadcom-sta-dkms/noble-proposed
Unfortunately, I did not save the output of the execution of that command, but here is the relevant output that was added to /var/log/apt/history.logafter I ran that command:
2026-03-01 19:28:28 startup archives unpack
2026-03-01 19:28:30 upgrade broadcom-sta-dkms:all 6.30.223.271-23ubuntu1.1 6.30.223.271-23ubuntu1.2
2026-03-01 19:28:30 status half-configured broadcom-sta-dkms:all 6.30.223.271-23ubuntu1.1
2026-03-01 19:28:41 status unpacked broadcom-sta-dkms:all 6.30.223.271-23ubuntu1.1
2026-03-01 19:28:41 status half-installed broadcom-sta-dkms:all 6.30.223.271-23ubuntu1.1
2026-03-01 19:28:42 status unpacked broadcom-sta-dkms:all 6.30.223.271-23ubuntu1.2
2026-03-01 19:28:42 startup packages configure
2026-03-01 19:28:42 configure linux-image-6.17.0-14-generic:amd64 6.17.0-14.14~24.04.1 <none>
2026-03-01 19:28:42 status half-configured linux-image-6.17.0-14-generic:amd64 6.17.0-14.14~24.04.1
2026-03-01 19:28:52 status installed linux-image-6.17.0-14-generic:amd64 6.17.0-14.14~24.04.1
2026-03-01 19:28:52 status triggers-pending linux-image-6.17.0-14-generic:amd64 6.17.0-14.14~24.04.1
2026-03-01 19:28:52 configure broadcom-sta-dkms:all 6.30.223.271-23ubuntu1.2 <none>
2026-03-01 19:28:52 status unpacked broadcom-sta-dkms:all 6.30.223.271-23ubuntu1.2
2026-03-01 19:28:52 status half-configured broadcom-sta-dkms:all 6.30.223.271-23ubuntu1.2
2026-03-01 19:29:24 status installed broadcom-sta-dkms:all 6.30.223.271-23ubuntu1.2
2026-03-01 19:29:24 configure linux-headers-6.17.0-14-generic:amd64 6.17.0-14.14~24.04.1 <none>
2026-03-01 19:29:24 status half-configured linux-headers-6.17.0-14-generic:amd64 6.17.0-14.14~24.04.1
2026-03-01 19:29:24 status installed linux-headers-6.17.0-14-generic:amd64 6.17.0-14.14~24.04.1
2026-03-01 19:29:24 configure linux-headers-generic-hwe-24.04:amd64 6.17.0-14.14~24.04.1 <none>
2026-03-01 19:29:24 status unpacked linux-headers-generic-hwe-24.04:amd64 6.17.0-14.14~24.04.1
2026-03-01 19:29:24 status half-configured linux-headers-generic-hwe-24.04:amd64 6.17.0-14.14~24.04.1
2026-03-01 19:29:24 status installed linux-headers-generic-hwe-24.04:amd64 6.17.0-14.14~24.04.1
2026-03-01 19:29:24 configure linux-generic-hwe-24.04:amd64 6.17.0-14.14~24.04.1 <none>
2026-03-01 19:29:24 status unpacked linux-generic-hwe-24.04:amd64 6.17.0-14.14~24.04.1
2026-03-01 19:29:24 status half-configured linux-generic-hwe-24.04:amd64 6.17.0-14.14~24.04.1
2026-03-01 19:29:24 status installed linux-generic-hwe-24.04:amd64 6.17.0-14.14~24.04.1
2026-03-01 19:29:24 trigproc linux-image-6.17.0-14-generic:amd64 6.17.0-14.14~24.04.1 <none>
2026-03-01 19:29:24 status half-configured linux-image-6.17.0-14-generic:amd64 6.17.0-14.14~24.04.1
2026-03-01 19:29:39 status installed linux-image-6.17.0-14-generic:amd64 6.17.0-14.14~24.04.1
After I ran the command sudo apt install broadcom-sta-dkms/noble-proposed I then followed @ogra’s suggestion of disabling / unckecking again the “Pre-released updates (noble-proposed)” checkbox and I then rebooted the computer (it booted well) and tested the Wi-Fi (it also worked well).