Hi all, I found that the package cups hav duplicated service file, Here is some cmdline interactivity: [root@system 09:47:09]$ pacman -Ql cups | grep service cups /usr/lib/systemd/system/cups.service cups /usr/lib/systemd/system/cupsd.service [root@system 09:47:48]$ diff cupsd.service cups.service gives no result. [root@system 09:46:35]$ cat cupsd.service [Unit] Description=CUPS Printing Service [Service] ExecStart=/usr/sbin/cupsd -f PrivateTmp=true [Install] Also=cups.socket cups.path WantedBy=printer.target [root@system 09:46:49]$ cat cups.service [Unit] Description=CUPS Printing Service [Service] ExecStart=/usr/sbin/cupsd -f PrivateTmp=true [Install] Also=cups.socket cups.path WantedBy=printer.target [root@system 09:46:31]$ systemctl enable cupsd.service Failed to issue method call: No such file or directory [root@system 09:52:28]$ systemctl enable cups.service ln -s '/usr/lib/systemd/system/cups.service' '/etc/systemd/system/printer.target.wants/cups.service' ln -s '/usr/lib/systemd/system/cups.socket' '/etc/systemd/system/sockets.target.wants/cups.socket' ln -s '/usr/lib/systemd/system/cups.path' '/etc/systemd/system/multi-user.target.wants/cups.path' -- Brock Zheng 郑 祎 Software Enginner