Please refer to the readme file that can be found in the directory cyusb_linux_1.05 which is obtained after downloading and extracting FX3 SDK for linux. This file contains the pre-requisites for installing FX3 SDK for linux.
qt4 is a pre-requisite for installing FX3 SDK for linux. So you need to install it before installing FX3 SDK. This can be done by using the following command:
sudo apt install qt4-default
Regarding your query on whether FX3 SDK can be installed on Ubuntu 18 or not, We have tested the SDK upto Ubuntu 16. But, we have seen customers installing and using the SDK for Ubuntu 18 also.
Yes, I installed the FX3 SDK on Ubuntu 18.04 LTS (x64 though) and built an app with no issues.
Were you able to resolve this issue? If not please let us know, if so then please take a minute to mark the thread as answered.
Best Regards, Sara