Unable to Locate Package Icmptx..need Help

I use the command:apt-get install icmptx in Kali and it shows unable to locate package icmptx...i also had this problem when I tried to install other tools,but I can fix it with chmod 775 ....(I know it needs execute permission). When it comes to icmptx,I use locate icmptx to find it first,but it shows no such thing...