Installation Issues in ubuntu

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http://askubuntu.com – #sudo apt-get install rrdtool Reading package lists... Done Building dependency tree Reading state information... Done rrdtool is already the newest version. 0 upgraded, 0 newly installed, 0 to remove and 423 not upgraded. 2 not fully installed or removed. After this operation, 0 B of additional disk space will be used. Do you want to continue [Y/n]? y Setting up qmail (1.06-4) ... The hostname -f command returned: $1 Your system needs to have a fully qualified domain name (fqdn) in order to install the var-qmail packages. Installation aborted. dpkg: error processing qmail (--configure): (HowTos)