Might not be an answer but there is solution !

Such a releaf. The windows version actually works flawlessly on ubuntu 18.04 with Wine and Carla.
Download the windows version of AmpliTube and downoad carla from theyre website search for carla vst on google.
To install carla, simply unpack the tarball on your home folder and you can start carla by double-clicking on the carla file. You may have to make it executable.
Install wine from ubuntu repository
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sudo apt install wine-stable
cd to where you downloaded AmpliTube and type
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wine ./Install\ AmpliTube\ 4\ \(Ver.\ 4.9.0\).exe
then go back in carla and configure the path to the vst pluggin folder inside the wine prefix usualy in /home/user/.wine.
After that, enable the wine bridge in Carla. Refresh the pluggins in the add pluggin menu and then your good to go. After that you can point your favorite linux DAW to the vst folder inside the carla folder. AmpliTube 4 works very well on reaper through carla, but obviously impossible to route audio in standalone mode must be run with carla. Custom shop and autentification works verygood as well.
P.S dont install Carla with apt-get because the version in the repository doesnt support wine-bridging .