Does not work on ubuntu 18 04 about alphaplot

[filipestevao]

Hi @Nikita-Presnov

AlphaPlot works perfectly if you install:

• Flatpak stable
• Flatpak beta
• Ubuntu ppa - Ubuntu 20.04

About AppImage:
The AppImage format works on Ubuntu 20.04 and others linux distributions that have glibc >= 2.29.
I did the packaging in AppImage and I am aware of this issue (see the discussions here and here). For AppImage to work on all linux distributions, it is necessary to compile on older base systems and it was very difficult to get the necessary libraries for AlphaPlot.
That was one of the reasons that I archived the "AlphaPlot-AppImage" repository and I will not support it in next releases. I strongly recommend install the flatpak.

To compile from source:
See the discussion here. You will need to download some libraries before runnig qmake or make.

[Nikita-Presnov]

You should write in README.md that AppImage version requires Ubuntu>=20.04 or another linux distributions that have glibc >= 2.29.
Also you should to write required libraries for compilation from source.