Can we install Vcenter server 5.5 on linux operating systems. If yes then how?
No you can't install on linux but you can use vCVA appliance which a SLES base vCenter Server.
We have need to know about vcenter server installation requirements.
Check the KB for the requirements http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1003882