Troubleshooting SD Card Recognition Issues in Ubuntu Linux

SD card recognition problems can be frustrating, especially when they occur suddenly without any apparent cause. If you're experiencing issues with your internal or external SD card not being recognized by the system after inserting it into a Multi-0 port on an Intel-based computer running Ubuntu 17 (or later), don't worry - there are several steps you can take to resolve this issue.

Firstly, ensure that the SD card itself is functional and properly inserted. Try removing and reinserting the card again while checking if the system recognizes it afterward. Sometimes, simply ejecting and re-ejecting the device from File Manager or right-clicking on 'Computer' > 'Manage' can resolve connectivity issues.

If the above step doesn't work, proceed with updating your drivers to ensure you're running the latest version:

1. Open a terminal window by pressing `Ctrl+Alt+T` simultaneously.

2. Type in `sudo apt-get update && sudo apt-get dist-upgrade -y` and press Enter key to execute this command.

If the problem persists after performing these steps, it may be due to an issue with your system's firmware or drivers for your specific hardware component (SD card reader). In such cases:

1. Power down your computer completely by pressing `Alt+Power button`.

2. Once powered off, press and hold `F12` key during boot-up.

3. Use the navigation keys (`↑`, `↓`) to select 'UEFI Firmware Settings' or similar depending on your manufacturer's BIOS/UEFI settings menu option.

4. Navigate through various tabs until you find an entry related to 'Boot Order' or 'Storage Devices'.

5. Move your SD card reader up in this list so that it appears above other storage devices like Hard Disk Drives (HDD) and Solid-State Disks (SSD).

6. Save Changes & Exit from the UEFI settings menu by pressing `F10`.

After restarting your computer, reinsert your SD card into its slot again and check if Ubuntu recognizes it now.

If none of these steps resolve your issue, there might be a deeper problem with either your hardware or operating system's configuration that requires professional assistance.

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