That magical program is Gnirehtet (tethering reversed) available as Android app and GNU/Linux desktop programs. With this program, without root access at all, we can easily share internet access via USB cable from laptop to smartphone by utilizing USB Tethering in reversed mode. Finally, the topology will be phone -> USB -> desktop -> wifi -> internet. I show you here how to do it with Ubuntu 18.04 LTS. Enjoy!

You may find it's difficult on Ubuntu Budgie 18.04 to share you internet access from wifi to wifi so your phone device can connect to the internet through your laptop. It does not require you to install any program. The requirement is only to have 2 wifi adapter (no matter either it's usb, pcmcia, or pci) so one used as receiver and one as transmitter. The steps are surprisingly short and easy. Let's go and happy surfing!

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I have written a post about using Pidgin to chat and file transfer over Local Area Network (LAN) with some tricks. There is another application which can do file transfer over LAN easily, just install it on both computers, and you are ready to go. Introducing Nitroshare!