Bluetooth adapter not found

I have an old laptop (+10 years) which had working Bluetooth on Windows last time I tested it a few years ago. It won't work on Zorin, though I haven't tested any other distros.

The bluetooth adapter should be there (it's internal) but blueman gives an error saying no adapter's found. My issue is a lot like this one.

The following was under Network in the output of inxi -Faz.

Network:
  Device-1: Intel PRO/Wireless 5100 AGN [Shiloh] Network driver: iwlwifi 
  v:[redacted] 
  IF: wlp2s0 state: up mac: <filter> 
  Device-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet 
  vendor: Hewlett-Packard driver: r8169 v:[redacted]
  IF: enp3s0 state: down mac: <filter>

Please post the outputs from lsusb and lspci

Nothing relevant (root hubs and webcam) is in the output of lsusb.

lspci:

Network controller: Intel Corporation PRO/Wireless 5100 AGN [Shiloh] Network Connection
Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 02)

Did a websearch using "Intel Corporation PRO/Wireless 5100 AGN Ubuntu 20.04" found this, but no real solution except keep to WPA2 from router and no more.

Also found drivers here:

Thanks, I've already downloaded the microcode but I'm not sure if I need it (or how to "install" it without compiling a custom kernel) since the wifi is working just fine.

I wonder if adding Blueman app may help. Blueman has been suggested to help solve Bluetooth issues before.
I don't need/use it myself, so others may have more to say about it.

Try

rfkill unblock wifi 

Or

rfkill unblock all

@Michel Note wifi is OK, only Bluetooth not OK.

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Oké, all i read is network/wifi. The AGN is NOT a bluetooth module someone said. Google gives me mixed results.

This is not surprising. Bluetooth is often combined into the Wifi Card (which makes sense to do).
But this does not mean it always is. This creates confusion as to whether or not it is there.

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Blueman can't find the adapter.

I'm still having the issue.