Ubuntu Bluetooth Speaker failed to reconnect after waking up from sleep

 First things first, we need to create a local service.

Just type it in the terminal

sudo nano /etc/systemd/system/headset-resume.service

Copy the entire script into it

Note that you have to change the Bluetooth MAC Address to your speaker.

[Unit]

Description=Force connect Bluetooth headset on resume

After=suspend.target

[Service]

Type=oneshot

# Wait for 3 seconds for device to power on

ExecStartPre=/bin/sleep 3

#  Force the mac address speaker

ExecStart=/usr/bin/bluetoothctl connect 34:CB:B9:BA:2B:F4

[Install]

WantedBy=suspend.target

Save and exit from Nano

Activate the scrip

sudo systemctl daemon-reload

then

sudo systemctl enable headset-resume.service

This will force the device to reconnect your speaker by the MAC address

Test it to sleep, it should be working by now. thanks for myself