Hi Ludwig, I just did the upgrade to 20210527 (from 20210524) with UsrMerge. Everything "appears" to have worked fine after rebooting and the merge looks like it was successful. Since this also updates the kernel to 5.12.4-2 that means vmware needs to recompile its modules (which it has done fine with all the previous kernel updates). I check to make sure that the following required patterns are still show to be installed (they do): Base Development C/C++ Development Linux Kernel Development And I verified that the new kernel source exists /usr/src/linux-5.12.4-2 /usr/src/linux-5.12.4-2-obj However, when vmware player (16.1.1) is started and it would normally compile its modules, instead it fails with: Kernel Headers 5.12.4-2-default were not found. Any idea what that problem is? Thanks! Joe