Troubleshooting

Glitching graphics with AMD GPUs and the amdgpu module

There may be problems due to differences in memory models in userspace and kernel drivers, in particular with 64-bit OpenGL applications running with AMD GPUs that use the amdgpu kernel module.

Either enable thunking (FELIX86_ENABLED_THUNKS=glx,vk), or, if running into issues with that, enable TSO with FELIX86_ALWAYS_TSO=1.

Sub-process apt-key exited unexpectedly

Ensure the rootfs is installed in a path accessible by every user. For example, /home/myuser/rootfs is not such a path, as /home/myuser is only accessible to myuser. Programs like apt will switch uid/gid and try to open apt-key, which will try to get a file descriptor to the rootfs and fail. Recommended rootfs install directory: /opt/felix86/rootfs, default by the install script.