Blueman can't find devices near me, while hcitool scan can

[Norbert]

Steps to reproduce:
1. Enable two my personal Bluetooth devices - Logitech M555b Mouse and SVEN bluetooth speaker, make both discoverable
2. Open terminal and launch `hcitool scan`:
```
$ hcitool scan
Scanning ...
 A0:E9:DB:20:FF:FF SVEN PS-100BL
 00:07:61:FD:FF:FF Logitech Bluetooth Mouse M555b
```

3. From the same terminal execute `blueman-manager` to get the same devices in GUI, to pair with them

Expected results:
* blueman-manager finds my devices, pair with them

Actual results:
* blueman-manager does not find my devices, shows error in terminal

```
$ blueman-manager
blueman-manager 16.17.35 ERROR Base:85 callback : Unhandled error for org.bluez.Adapter1.StopDiscovery
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/blueman/bluez/Base.py", line 78, in callback
    value = proxy.call_finish(result).unpack()
gi.repository.GLib.GError: g-io-error-quark: GDBus.Error:org.bluez.Error.InProgress: Operation already in progress (36)
```

ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: blueman 2.2.2-1
ProcVersionSignature: Ubuntu 5.13.0-20.20-generic 5.13.14
Uname: Linux 5.13.0-20-generic x86_64
ApportVersion: 2.20.11-0ubuntu70
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: MATE
Date: Sun Oct 24 16:16:05 2021
InstallationDate: Installed on 2021-10-24 (0 days ago)
InstallationMedia: Ubuntu-MATE 21.10 "Impish Indri" - Release amd64 (20211012)
SourcePackage: blueman
UpgradeStatus: No upgrade log present (probably fresh install)

[Norbert (nrbrtx)]

screenshot of blueman

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Daniel LaSalle (daniellasalle)]

I have the same problem and here is my story about it:

Using 21.10-latest and using a Marshall Woburn II Bluetooth speaker, when putting the speaker into discovery mode, both hcitool & Bluetooth Devices(Bluetooth Manager) find it yet system always ends up with "Bluetooth: Pairing failed for: WOBURN II...".

```
$ hcitool scan
Scanning ...
 54:B7:E5:70:E8:37 WOBURN II
$
```

[Daniel LaSalle (daniellasalle)]

PS: I have been having this problem using both Logitech and Microsoft joysticks since AT LEAST 18.04 .........

[Daniel LaSalle (daniellasalle)]

PSS: And Sony!

[YAFU (yafu)]

Same problem here on Ubuntu 20.04, using TP-Link ub400 usb bluetooth adapter (Cambridge Silicon Radio) blueman/bluez doesn't detect my audio device, but hcitool does:

$ hcitool scan
Scanning ...
        B8:D5:0B:08:42:3E Avantree Clipper Pro

Please add the fix to Ubuntu 20.04 (Long-Term Support ?)