Comment 2 for bug 1882407

Although the openafs-client package happens to include a command named ‘sys’, it’s almost certainly not the one you’re looking for. openafs-client is for connecting to the AFS network filesystem (https://en.wikipedia.org/wiki/Andrew_File_System). What are you trying to do?

As for the errors with –f and ––purge, you want -f and --purge instead (with the normal hyphen that you can type on your keyboard, not a Unicode dash character).