Comment 2 for bug 1903408

Hello,
I have the same issue.
I believe the problem is with blueman.

I had raspberry pi os on a pi4 working and a bluetooth mouse which paired easily.
When I tried MATE with with blueman I couldn't pair, it was constantly failing.

I just managed using the wizard,
by clicking on the bluetooth icon on top of the desktop and click on "Set Up New Device..." and follow the wizard and I got the bluetooth mouse paired and working now.

My uname --all
Linux umatepi 5.4.0-1022-raspi #25-Ubuntu SMP PREEMPT Thu Oct 15 13:31:49 UTC 2020 aarch64 aarch64 aarch64 GNU/Linux

my cat /proc/version
Linux version 5.4.0-1022-raspi (buildd@bos02-arm64-055) (gcc version 9.3.0 (Ubuntu 9.3.0-17ubuntu1~20.04)) #25-Ubuntu SMP PREEMPT Thu Oct 15 13:31:49 UTC 2020

my hostnamectl
   Static hostname: umatepi
         Icon name: computer
        Machine ID: 6ec1e507ebad4b7fac8cbcdbe4fe0b09
           Boot ID: 8752d1267a67471987c2c52bf45c8251
  Operating System: Ubuntu 20.04.1 LTS
            Kernel: Linux 5.4.0-1022-raspi
      Architecture: arm64
my dmesg | grep -i blue
[ 6.893802] Bluetooth: Core ver 2.22
[ 6.893872] Bluetooth: HCI device and connection manager initialized
[ 6.893893] Bluetooth: HCI socket layer initialized
[ 6.893902] Bluetooth: L2CAP socket layer initialized
[ 6.893916] Bluetooth: SCO socket layer initialized
[ 9.434910] Bluetooth: HCI UART driver ver 2.3
[ 9.434918] Bluetooth: HCI UART protocol H4 registered
[ 9.434922] Bluetooth: HCI UART protocol BCSP registered
[ 9.434958] Bluetooth: HCI UART protocol LL registered
[ 9.434962] Bluetooth: HCI UART protocol ATH3K registered
[ 9.434985] Bluetooth: HCI UART protocol Three-wire (H5) registered
[ 9.435110] Bluetooth: HCI UART protocol Intel registered
[ 9.435198] Bluetooth: HCI UART protocol Broadcom registered
[ 9.435229] Bluetooth: HCI UART protocol QCA registered
[ 9.435233] Bluetooth: HCI UART protocol AG6XX registered
[ 9.435256] Bluetooth: HCI UART protocol Marvell registered
[ 10.642949] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 10.642957] Bluetooth: BNEP filters: protocol multicast
[ 10.642969] Bluetooth: BNEP socket layer initialized
[ 16.748870] Bluetooth: RFCOMM TTY layer initialized
[ 16.748894] Bluetooth: RFCOMM socket layer initialized
[ 16.748913] Bluetooth: RFCOMM ver 1.11
[ 1783.168237] input: BluetoothMouse3600 Mouse as /devices/virtual/misc/uhid/0005:045E:0916.0004/input/input3
[ 1783.168564] input: BluetoothMouse3600 Consumer Control as /devices/virtual/misc/uhid/0005:045E:0916.0004/input/input4
[ 1783.173337] hid-generic 0005:045E:0916.0004: input,hidraw3: BLUETOOTH HID v1.00 Mouse [BluetoothMouse3600] on b8:27:eb:d0:af:99

my apt policy blueman
blueman:
  Installed: 2.1.2-1ubuntu0.2
  Candidate: 2.1.2-1ubuntu0.2
  Version table:
 *** 2.1.2-1ubuntu0.2 500
        500 http://ports.ubuntu.com/ubuntu-ports focal-security/universe arm64 Packages
        500 http://ports.ubuntu.com/ubuntu-ports focal-updates/universe arm64 Packages
        100 /var/lib/dpkg/status
     2.1.2-1 500
        500 http://ports.ubuntu.com/ubuntu-ports focal/universe arm64 Packages

my apt policy bluez
bluez:
  Installed: 5.53-0ubuntu3
  Candidate: 5.53-0ubuntu3
  Version table:
 *** 5.53-0ubuntu3 500
        500 http://ports.ubuntu.com/ubuntu-ports focal/main arm64 Packages
        100 /var/lib/dpkg/status

please let me know if you need additional information.