i downloaded the .deb file for yumi from the pendrive website and went the software center opens the file, it says it cant install because the dependencies are not satisfiable : gambus3-runtime. it tried to install it but its not it the default respositories.
As far as other alternatives to Yumi, there is as stated by @Angel Salinas Huerta, Multisystem. To install, just press Ctrl+Alt+T on your keyboard to open Terminal. When it opens, run the command(s) below:
As far as installing Yumi, you have to install gambas3 prior to installing yumi to satisfy dependencies.
To install, download Yumi deb file. After the file is downloaded, just press Ctrl+Alt+T on your keyboard to open Terminal. When it opens, navigate to where the file was downloaded (Probably the Downloads Folder), and run the command(s) below:
That should install Yumi, See images below.
Multisystem, previously multiboot, works fine to me:
http://www.pendrivelinux.com/multiboot-create-a-multiboot-usb-from-linux/
If you want to add repositories to keep it updated or download an iso:
http://liveusb.info/dotclear/index.php?pages/install