There are a couple of posts about this issue that are pretty old now, but the solutions suggested did not solve the problem for me. I installed libgdiplus-6.2-3.fc44 and ensured the module libgdiplus.so.0 was provided by it. I also have libtiff-4.7.2.1 installed, which appears to be the latest version. But Repetier Host still fails with the same error. I downloaded the appimage two days ago so it is the latest version. Is there a solution to this problem? I'm using Ultramarine Linux, Fedora based. I also tried Debian 13 but that didn't work either.
All advice gratefully received.
EDIT. I tried the appimage on KDE Linux (Arch based immutable distro) and immediately found I needed mono. The KDE recommendation is to install missing libraries in a container, so I installed mono in a debian container, then found I needed fusermount as well. Installing fuse3 in the container solved that problem too. So I ran the appimage from the debian container and it started but is not working. The menu bar and toolbar were both missing, just black space at the top of the window. The 3d view was also black. On the right there is a series of what appear to be menu choices, but none of them do anything. Below that is another black space, then some buttons that look like they are for manipulating the object in the 3d view. None of them do anything either. At the bottom there is what appears to be a log display, telling me the OpenGL version (4.6) and another informational message. There is also a row of selection buttons. Clicking anywhere in the window has no effect. Even the window close button doesn't work. The maximise and minimise buttons work though.
EDIT 2. It works perfectly on Windows. Also, interestingly, it works perfectly on Linux Mint.