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Various breakage

  1. update-core is missing.

    The function of update-core is transferred to pacman -Syuu.

  2. A command window lingers after startup.

    Change the argument /K to /C in all three start menu shortcuts.

  3. What to do when Pacman is telling me there are conflicts in the file system?

    This indicates that Pacman isn't sure it is safe to overwrite some files. This sometimes happens during regular package updates, but could also happen if you installed some software manually (make install, npm install npm -g etc.). To continue with the operation, pass --overwrite <conflicting_file_path> to the Pacman command line. For other options, see the Arch Linux FAQ entry about Pacman file conflicts.

  4. GCC update breaks dependencies for Ada and ObjC.

    looking for conflicting packages...
    error: failed to prepare transaction (could not satisfy dependencies)
    :: installing mingw-w64-x86_64-gcc (9.1.0-1) breaks dependency 'mingw-w64-x86_64-gcc=8.3.0-2' required by mingw-w64-x86_64-gcc-ada
    :: installing mingw-w64-x86_64-gcc (9.1.0-1) breaks dependency 'mingw-w64-x86_64-gcc=8.3.0-2' required by mingw-w64-x86_64-gcc-objc
    :: installing mingw-w64-x86_64-gcc (9.1.0-1) breaks dependency 'mingw-w64-i686-gcc=8.3.0-2' required by mingw-w64-i686-gcc-ada
    :: installing mingw-w64-x86_64-gcc (9.1.0-1) breaks dependency 'mingw-w64-i686-gcc=8.3.0-2' required by mingw-w64-i686-gcc-objc

    Ada and ObjC were unsupported for a while in MSYS2 builds due to long-standing issues with the i686 variant. One had to run pacman -R mingw-w64-x86_64-gcc-ada mingw-w64-x86_64-gcc-objc and/or pacman -R mingw-w64-i686-gcc-ada mingw-w64-i686-gcc-objc, then update.

  5. Pacman fails to install packages with Unrecognized archive format.

    For a while, the core packages were prematurely packaged using zstd without giving users time to update to zstd-enabled pacman first. This should be resolved now.

  6. MSYS2 fails to start after an update. Installer fails to re-install.

    Make sure there are no msys2 processes running (especially sshd, dirmngr, gpg-agent, bash, pacman and mintty) and try again. If that fails, try a reboot.