Questions[detect](ubuntu)

Similarly to this question I can't pair my new headphones (Marshall Major III) to my laptop because I can't find the device. I can connect the headphones to my phone (XperiaL1) and my laptop can detect my phone. I read other answers and I tried this solution:

rfkill block bluetooth
sudo service bluetooth stop
sudo rfkill unblock bluetooth

Nothing changed. The strangest thing is that yesterday my headphones were both detected and connected to my laptop!

The output of service bluetooth status

<pre><font color="#8AE234"><b>●</b></font> bluetooth.service - Bluetooth service
   Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset
   Active: <font color="#8AE234"><b>active (running)</b></font> since Fri 2020-06-05 14:25:31 EEST; 18min ago
     Docs: man:bluetoothd(8)
 Main PID: 911 (bluetoothd)
   Status: &quot;Running&quot;
    Tasks: 1 (limit: 4915)
   CGroup: /system.slice/bluetooth.service
           └─911 /usr/lib/bluetooth/bluetoothd

Ιουν 05 14:25:31 piyi-Inspiron-5558 bluetoothd[911]: Bluetooth daemon 5.48
Ιουν 05 14:25:31 piyi-Inspiron-5558 bluetoothd[911]: Starting SDP server
Ιουν 05 14:25:31 piyi-Inspiron-5558 bluetoothd[911]: Bluetooth management interf
Ιουν 05 14:25:31 piyi-Inspiron-5558 systemd[1]: Starting Bluetooth service...
Ιουν 05 14:25:31 piyi-Inspiron-5558 systemd[1]: Started Bluetooth service.
Ιουν 05 14:26:20 piyi-Inspiron-5558 bluetoothd[911]: Endpoint registered: sender
Ιουν 05 14:26:20 piyi-Inspiron-5558 bluetoothd[911]: Endpoint registered: sender
<span style="background-color:#FFFFFF"><font color="#300A24">lines 1-17/17 (END)</font></span>

What can I do?

I was working on this project here, and to detect pictures I have to run:

cd darknet
make

then the triggering command line:

./darknet detect cfg/yolov3.cfg yolov3.weights data/dog.jpg

So, my question is, How can I make it run automatically once I throw a picture inside the data folder? So, what I want is, whenever my Motion camera detector detects a motion, it will save it in the darknet/data then the command line will do the analysis or detection (image recognition) and saves it in some other folder!

How possible is that?!

I have a dual-boot system (Windows 10/Ubuntu). Recently I bought an MX Master 2 Bluetooth mouse. I tend to use it without a receiver. Now in Windows 10, I can pair it and it works perfectly but, Ubuntu doesn't even detect the mouse. However, Ubuntu detects and successfully pairs other devices, like my Bluetooth earbuds and Bluetooth speaker. Any ideas What the problem might be?

So, I'm using my brand new HARD DRIVE CADDY SATA III in CPU.

When I mount the HDD/SSD physically in the mounting bracket, I can click on "Scan for hardware changes" in "Device Manager" of Windows 7 to detect HDD/SSD. Now, how can I do like it in Ubuntu 18.04? I mean how can I detect HDD/SSD without rebooting Ubuntu?

I have three questions that I need to type in Ubuntu's terminal:

1. What command can I type to detect HDD/SSD via IDE and SATA?
2. What command can I type to remove plug-in with HDD/SSD via IDE or SATA?
3. What the best way can I change HDD/SSD physically via IDE or SATA without any problem?

I am trying to find a way to query the state of my laptop from the terminal. I would like to know if it is asleep or awake.

Is there a dbus query suitable for this?