how to make ubuntu live usb contains spasific apps and my wifi driver

Two wayes that i trayed them

make a "Persistent Live System" USB by mkusb

"mkusb a safe tool to create a bootable drive from an iso image or a compressed image file.1

installation:

$ sudo add-apt-repository universe # only for standard Ubuntu live
$ sudo add-apt-repository ppa:mkusb/ppa # and press Enter
$ sudo apt update
$ sudo apt install mkusb
$ sudo apt install mkusb usb-pack-efi

The following command is an alternative for systems without a graphic environment for example Ubuntu Server

sudo apt install dus mkusb-nox

installation instructions

The tool has a command line version and a GUI version. You can launch the GUI version from Ubuntu's Dock by selecting the "guidus" app.2

1. Launch guidus or mkusb from launcher
2. Select i Install (make a boot device)
3. Select p 'Persistent live' - only Debian and Ubuntu
4. Select sdb (or whatever is your USB disk) play more attention in this step to make sure you realy select usb drive not hard drive.
5. Move the slider to select free space you want (80% is good for a 4-8GB USB stick)
6. Select Go
   mkUSB-quick-start-manual-22.pdf
   this is my Persistent Live System after some customization
   

make live usb from my current operating system by systemback

I created a live usb/installation from my system’s file and all my configurations by the Systemback utility.

    $ sudo add-apt-repository "deb http://ppa.launchpad.net/nemh/systemback/ubuntu xenial main"
$ sudo apt update
$ sudo apt install systemback

this is screenshot of my usb drive that crated by systemback