Dear Centos User I am trying to install package like 1) pymol 2 Xmgrace But unable install this package, showing this error. I search for this error in google, but the suggestions given there is not working for me. The same message showing for both software pakage. root at localhost tmp]# yum install grace Loaded plugins: fastestmirror, langpacks Loading mirror speeds from cached hostfile * base: ftp.iitm.ac.in * elrepo: elrepo.mirrors.arminco.com * epel: epel.mirror.net.in * extras: ftp.iitm.ac.in * rpmforge: apt.sw.be * updates: ftp.iitm.ac.in No package grace available. Error: Nothing to do root at localhost tmp]# Please suggest me to how to resolve the problem ? Thank you in advance for help Regards Rahman ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' *Md Homaidur Rahman* PhD Research Scholar Computational Biophysics Lab. Department of Biotechnology Indian Institute of Technology-Madras Chennai-600 036 *Mobile No = +91- 7845991785* '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''