Ubuntu 20.04 is the latest LTS (Long Term Support) version, so it is very important for miniSIPServer to support this platform.
Unfortunately, Ubuntu 20.04 has cut Qt4 and all its libraries, so we have to upgrade miniSIPServer to V37 (build 20200424) with Qt5. Now it is perfect to run miniSIPServer on Ubuntu 20.04. Please refer to following figure.
By the way, miniSIPServer for Windows will stay with Qt4 since we have to support several old Windows systems, such as XP and 7, and so on. In the future, as planed, V38 will say goodbye to Qt4 finally on all platforms.