Ubuntu 20.04 Bluetooth service running but blueman is not working

I have the bluetooth service running:

$ sudo systemctl status bluetooth.service 
● bluetooth.service - Bluetooth service
     Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
     Active: active (running) since Tue 2022-05-31 10:30:38 IST; 13min ago
       Docs: man:bluetoothd(8)
   Main PID: 3329 (bluetoothd)
     Status: "Running"
      Tasks: 1 (limit: 18966)
     Memory: 6.2M
     CGroup: /system.slice/bluetooth.service
             └─3329 /usr/lib/bluetooth/bluetoothd

May 31 10:30:38 legion systemd[1]: Starting Bluetooth service...
May 31 10:30:38 legion bluetoothd[3329]: Bluetooth daemon 5.53
May 31 10:30:38 legion systemd[1]: Started Bluetooth service.
May 31 10:30:38 legion bluetoothd[3329]: Starting SDP server
May 31 10:30:38 legion bluetoothd[3329]: Bluetooth management interface 1.20 initialized

But when I run the blueman-manager executable, it fails with error:

$ blueman-manager 
blueman-manager version 2.1.2 starting
blueman-manager 10.49.28 ERROR    Manager:118 on_dbus_name_appeared: Default adapter not found, trying first available.
blueman-manager 10.49.28 ERROR    Manager:122 on_dbus_name_appeared: No adapter(s) found, exiting

Earlier, bluetooth never gave me any issues. Recently, I've put the laptop to sleep for more than 4 hours ( I usually put it to sleep for less than 1 hour), after which from the next restart, bluetooth is not working.

I'm running ubuntu 20.04 + i3wm

Any help would be greatly appreciated!