Sometimes the Bluetooth in Linux may not working properly.
You can solve it by removing the default blueberry application, and install blueman.

Steps:
1. Open Terminal and type sudo apt remove blueberry and follow the steps.

2. Then type sudo apt install blueman

Open blueman app and connect your device. (For Mobile phones, use “network access point” )

Tip: Open blueman > go to View > local services > select “accept files from trusted devices” under “Transfer section”

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