Re: Pacman -Syu throws this message at the end.
Reply #19 –
If a file says .part it's usually only partly downloaded.
:: Retrieving packages...
error: could not open file /mnt/var/cache/pacman/pkg/zlib-1:1.2.11-4-x86_64.pkg.tar.xz.part: Invalid argument
Perhaps the error is it's trying to download the package file to that location but cannot for some reason.