Hi Osram,
Check the readme file contained within the Linux wallet download,
I will paste here what you need. It works on Ubuntu 18.04 for sure as that is my machine I use as well.
To run the Uranium-X QT out of the box on a fresh Linux OS, the following packages are required: <500MB total
-----
sudo apt-get install libqrencode3
sudo apt-get install qt5-default
sudo apt-get install libqt5network5
sudo apt-get install build-essential libtool autotools-dev automake pkg-config libssl-dev libevent-dev bsdmainutils
sudo apt-get install libboost-system-dev libboost-filesystem-dev libboost-chrono-dev libboost-program-options-dev libboost-test-dev libboost-thread-dev
sudo apt-get install libboost-all-dev
sudo apt-get install libdb4.8-dev libdb4.8++-dev
sudo apt-get install libdb5.3++
sudo apt-get update
sudo apt-get install software-properties-common
sudo add-apt-repository ppa:bitcoin/bitcoin
[press ENTER]
sudo apt-get update
DONE!
--> Launch uraniumx-qt
cd yourfilepath ./uraniumx-qt