Hi Ludwig, Ok, I fixed the problem on my system but it looks like I found something missed in the kernel source packages. Here is the issue: 20210527 installs kernel 5.12.4-2 with /usr/lib/modules/5.12.4-2-default/build as a symlink to ../../../usr/src/linux-5.12.4-2-obj/x86_64/default That symlink is bad and should be to ../../../../usr/src/linux-5.12.4-2-obj/x86_64/default Since it was a new kernel install, it seems to me that it would not be a UsrMerge bug and instead would be a bug in the kernel-source package. After recreating the correct symlink using cd /usr/lib/modules/5.12.4-2-default ln -s ../../../../usr/src/linux-5.12.4-2-obj/x86_64/default build vmware player 16.1.1 was then able to recompile the vmware kernel modules successfully. I checked the prior kernel source symlink in /usr/lib/modules/5.12.4-1-default/build and found that it too was wrong so that appears to be something that the UsrMerge migration missed. Please let me know if you need any other information. Thanks! Joe