How to download and setup multibootusb
Open terminal and run command
                                            git clone https://github.com/mbusb/multibootusb.git
                                        
                                        git clone is used to create a copy or clone of multibootusb repositories.
                                        You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with multibootusb https://github.com/mbusb/multibootusb/archive/master.zip
Or simply clone multibootusb with SSH
                                            [email protected]:mbusb/multibootusb.git                                    
                                    If you have some problems with multibootusb
You may open issue on multibootusb support forum (system) here: https://github.com/mbusb/multibootusb/issuesSimilar to multibootusb repositories
Here you may see multibootusb alternatives and analogs
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