对于 16.0，请以根用户 root 运行下面命令：
zypper addrepo https://download.opensuse.org/repositories/X11:xfce/16.0/X11:xfce.repo
zypper refresh
zypper install package-update-indicator
对于 15.7，请以根用户 root 运行下面命令：
zypper addrepo https://download.opensuse.org/repositories/X11:xfce/15.7/X11:xfce.repo
zypper refresh
zypper install package-update-indicator
对于 15.6，请以根用户 root 运行下面命令：
zypper addrepo https://download.opensuse.org/repositories/X11:xfce/15.6/X11:xfce.repo
zypper refresh
zypper install package-update-indicator