In Linux, you can mount an SD card using the command-line interface. Here's a step-by-step guide on how to do it:

Insert the SD Card:
Insert the SD card into the SD card slot on your computer or into an external card reader connected to your computer.
Check Disk Information:
Open a terminal window. You can usually find the terminal in your Applications menu or by pressing the keyboard shortcut Ctrl + Alt + T.
Identify the Device:
To mount the SD card, you need to know the device identifier associated with it. You can use the `lsblk` command to list all block devices, including your SD card. Run the following command:
```
lsblk
```
Look for the SD card's device identifier, which is often something like `/dev/sdX`, where "X" is a letter indicating the specific device (e.g., `/dev/sdb`, `/dev/sdc`, etc.).
Create a Mount Point:
You need to create a directory where the contents of the SD card will be accessible. You can create a directory in your home folder or any other location. For example, to create a directory called "sdcard" in your home folder, run:
```
mkdir ~/sdcard
```
Mount the SD Card:
Now you can mount the SD card using the `mount` command. Replace `/dev/sdX` with the actual device identifier of your SD card:
```
sudo mount /dev/sdX ~/sdcard
```
The `sudo` command is used to give you superuser privileges, which are often required to mount devices.
Access the Mounted SD Card:
Once the SD card is mounted, you can access its contents in the directory you created. You can use the file manager or the terminal to navigate to the mount point (`~/sdcard` in the example above).
Unmount the SD Card:
When you're done using the SD card, it's important to unmount it properly before removing it. Use the `umount` command followed by the mount point to unmount the SD card:
```
sudo umount ~/sdcard
```