Thanks Sebastien. I already know uninstalling blueman doesn't help as I did install it exactly because I couldn't connect to the bluetooth device with gnome-control-center. I was pretty surprised to see it worked.
bluetoothctl behaves exactly like blueman-manager: does not work if gnome-control-center is open on the Bluetooth section, does work otherwise. This is the failure message: Attempting to connect to 00:22:D9:00:1A:6F Failed to connect: org.bluez.Error.Failed I'll reboot before collecting the full `journalctl -b 0` log you requested, so you'll get a cleaner log. ** Changed in: gnome-control-center (Ubuntu) Status: Incomplete => New -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-control-center in Ubuntu. https://bugs.launchpad.net/bugs/1870356 Title: Can't connect to paired bluetooth devices via g-c-c; works with blueman Status in gnome-control-center package in Ubuntu: New Bug description: I have a paired bluetooth device listed as "Disconnected" in the Bluetooth section of gnome-control-center. In order to connect to it I click on the device name and switch the "Connection" slider to the "on" position. The slider moves but immediately bounces back to the "off" position, and nothing happens: the connection is not established. It never works even if I try several times. This happens on an up-to-date Focal system and it's always reproducible across reboots and power cycles of the device. I don't think it's a problem of the device itself or of the underlying bluetooth stack, as connecting/disconnecting to the device works perfectly if I use bluetooth-manager instead of gnome-control-center. I don't know if this is a regression as I was not using bluetooth before installing Focal. FWIW (very little), the device connects/disconnects perfectly to Android phones. --- ProblemType: Bug ApportVersion: 2.20.11-0ubuntu22 Architecture: amd64 CurrentDesktop: ubuntu:GNOME DistroRelease: Ubuntu 20.04 InstallationDate: Installed on 2019-02-26 (400 days ago) InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Alpha amd64 (20190226) NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair Package: gnome-control-center 1:3.36.1-1ubuntu2 PackageArchitecture: amd64 ProcVersionSignature: Ubuntu 5.4.0-20.24-generic 5.4.27 Tags: focal uec-images wayland-session third-party-packages Uname: Linux 5.4.0-20-generic x86_64 UpgradeStatus: Upgraded to focal on 2020-01-21 (72 days ago) UserGroups: adm cdrom dialout dip docker libvirt lpadmin lxd plugdev sambashare sbuild sudo utah _MarkForUpload: True To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1870356/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp