Hi, I'm not really sure if this actually is a bug or intended behaviour but upgrading pacman man my freshly installed system with [testing] enabled just broke pacman: $ pacman pacman: error while loading shared libraries: liblzma.so.5: cannot open shared object file: No such file or directory After some investigation, I figured out that "liblzma.so" is part of xz-utils which was renamed to "xz" sometime ago. When doing the first full system upgrade, pacman asked me to upgrade itself, first. As "SyncFirst" packages seem to be pulled in without dependency resolution, I ended up in having pacman 3.5.0, but an old xz-utils, resulting in some broken pacman depending on some shared library of a package that hasn't been upgraded yet. Is that intended? Unfortunately, I'm in a rush and I don't have any time to analyze this in detail right now...