Yes, I just removed the mouse under gnome-control-center, went into
`bluetoothctl` and tried to pair it again:

[bluetooth]# scan on
Discovery started
[NEW] Device 49:4E:A7:0B:A0:51 49-4E-A7-0B-A0-51
[NEW] Device 34:88:5D:3E:A1:A4 Bluetooth Mouse M336/M337/M535
[bluetooth]# pair 34:88:5D:3E:A1:A4 
Attempting to pair with 34:88:5D:3E:A1:A4
[CHG] Device 34:88:5D:3E:A1:A4 Connected: yes
[CHG] Device 34:88:5D:3E:A1:A4 Modalias: usb:v046DpB014d1200
[CHG] Device 34:88:5D:3E:A1:A4 UUIDs: 00001000-0000-1000-8000-00805f9b34fb
[CHG] Device 34:88:5D:3E:A1:A4 UUIDs: 00001124-0000-1000-8000-00805f9b34fb
[CHG] Device 34:88:5D:3E:A1:A4 UUIDs: 00001200-0000-1000-8000-00805f9b34fb
[CHG] Device 34:88:5D:3E:A1:A4 ServicesResolved: yes
[CHG] Device 34:88:5D:3E:A1:A4 Paired: yes
Pairing successful
[CHG] Device 34:88:5D:3E:A1:A4 ServicesResolved: no
[CHG] Device 34:88:5D:3E:A1:A4 Connected: no
[bluetooth]# pair 34:88:5D:3E:A1:A4 
Attempting to pair with 34:88:5D:3E:A1:A4
Failed to pair: org.bluez.Error.AlreadyExists
[bluetooth]# connect 34:88:5D:3E:A1:A4 
Attempting to connect to 34:88:5D:3E:A1:A4
Failed to connect: org.bluez.Error.Failed
[bluetooth]# version
Version 5.50
[bluetooth]# quit

$ uname -a
Linux michal-laptop 4.18.0-16-generic #17-Ubuntu SMP Fri Feb 8 00:06:57 UTC 
2019 x86_64 x86_64 x86_64 GNU/Linux

bluetoothctl claims it pairs it, but then disconnects again. The mouse
continues to blink, remaining in pairing mode.

Even when it does pair successfully, only every 10 times or so does the
pairing "persist" across suspend/reboot cycles. Most often I have to re-
pair from scratch every boot/resume.

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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to bluez in Ubuntu.
https://bugs.launchpad.net/bugs/1777062

Title:
  Logitech M535 mouse only pairs successfully after 4-5 tries

Status in bluez package in Ubuntu:
  Incomplete

Bug description:
  I've had my mouse (Logitech M535) paired and working since upgrading
  to 18.04. I had to re-do the pairing after connecting to a different
  machine and now it takes 4-5 tries of pair/remove to connect the
  mouse, on every reboot / sleep cycle.

  The logs show:
  cze 15 07:45:37 michal-laptop bluetoothd[4168]: 34:88:5D:3E:A1:A4: error 
updating services: Device or resource busy (16)
  cze 15 07:46:14 michal-laptop bluetoothd[4168]: Can't get HIDP connection info

  But neither actually seem critical as this is shown upon successful
  pairing as well.

  a bluetoothctl session of a failed pairing:
  [bluetooth]# pair 34:88:5D:3E:A1:A4 
  Attempting to pair with 34:88:5D:3E:A1:A4
  [CHG] Device 34:88:5D:3E:A1:A4 Connected: yes
  [CHG] Device 34:88:5D:3E:A1:A4 Modalias: usb:v046DpB014d1200
  [CHG] Device 34:88:5D:3E:A1:A4 UUIDs: 00001000-0000-1000-8000-00805f9b34fb
  [CHG] Device 34:88:5D:3E:A1:A4 UUIDs: 00001124-0000-1000-8000-00805f9b34fb
  [CHG] Device 34:88:5D:3E:A1:A4 UUIDs: 00001200-0000-1000-8000-00805f9b34fb
  [CHG] Device 34:88:5D:3E:A1:A4 ServicesResolved: yes
  [CHG] Device 34:88:5D:3E:A1:A4 Paired: yes
  Pairing successful
  [CHG] Device 34:88:5D:3E:A1:A4 ServicesResolved: no
  [CHG] Device 34:88:5D:3E:A1:A4 Connected: no

  The mouse continues in pairing mode.

  When using the gnome-control-center Bluetooth module:
  cze 15 08:23:40 michal-laptop bluetoothd[19188]: 34:88:5D:3E:A1:A4: error 
updating services: Device or resource busy (16)
  cze 15 08:23:40 michal-laptop bluetoothd[19188]: 34:88:5D:3E:A1:A4: error 
updating services: Device or resource busy (16)
  cze 15 08:23:41 michal-laptop bluetoothd[19188]: 34:88:5D:3E:A1:A4: error 
updating services: Device or resource busy (16)
  cze 15 08:23:41 michal-laptop bluetoothd[19188]: 34:88:5D:3E:A1:A4: error 
updating services: Device or resource busy (16)
  cze 15 08:23:42 michal-laptop bluetoothd[19188]: 34:88:5D:3E:A1:A4: error 
updating services: Device or resource busy (16)
  cze 15 08:23:42 michal-laptop bluetoothd[19188]: 34:88:5D:3E:A1:A4: error 
updating services: Device or resource busy (16)
  cze 15 08:23:43 michal-laptop bluetoothd[19188]: 34:88:5D:3E:A1:A4: error 
updating services: Device or resource busy (16)

  Finally when it connects:
  [NEW] Device 34:88:5D:3E:A1:A4 Bluetooth Mouse M336/M337/M535
  [CHG] Device 34:88:5D:3E:A1:A4 Trusted: yes
  [CHG] Device 34:88:5D:3E:A1:A4 Connected: yes
  [CHG] Device 34:88:5D:3E:A1:A4 Modalias: usb:v046DpB014d1200
  [CHG] Device 34:88:5D:3E:A1:A4 UUIDs: 00001000-0000-1000-8000-00805f9b34fb
  [CHG] Device 34:88:5D:3E:A1:A4 UUIDs: 00001124-0000-1000-8000-00805f9b34fb
  [CHG] Device 34:88:5D:3E:A1:A4 UUIDs: 00001200-0000-1000-8000-00805f9b34fb
  [CHG] Device 34:88:5D:3E:A1:A4 ServicesResolved: yes
  [CHG] Device 34:88:5D:3E:A1:A4 Paired: yes

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: bluez 5.48-0ubuntu3
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  Uname: Linux 4.15.0-23-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Jun 15 07:46:38 2018
  InterestingModules: rfcomm bnep btusb bluetooth
  MachineType: Dell Inc. XPS 12-9Q33
  ProcKernelCmdLine: BOOT_IMAGE=/ROOT/ubuntu@/boot/vmlinuz-4.15.0-23-generic 
root=ZFS=username-laptop/ROOT/ubuntu ro quiet splash vt.handoff=1
  SourcePackage: bluez
  UpgradeStatus: Upgraded to bionic on 2018-02-07 (127 days ago)
  dmi.bios.date: 03/03/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A08
  dmi.board.name: XPS 12-9Q33
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A08
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Not Specified
  dmi.modalias: 
dmi:bvnDellInc.:bvrA08:bd03/03/2015:svnDellInc.:pnXPS12-9Q33:pvrA08:rvnDellInc.:rnXPS12-9Q33:rvrA08:cvnDellInc.:ct8:cvrNotSpecified:
  dmi.product.name: XPS 12-9Q33
  dmi.product.version: A08
  dmi.sys.vendor: Dell Inc.
  hciconfig:
   hci0:        Type: Primary  Bus: USB
        BD Address: 5C:51:4F:1D:50:3C  ACL MTU: 1021:5  SCO MTU: 96:5
        UP RUNNING PSCAN ISCAN 
        RX bytes:16702 acl:290 sco:0 events:716 errors:0
        TX bytes:44162 acl:142 sco:0 commands:427 errors:0

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