I have recently setup Ubuntu 16.10 and am trying to install PuTTY but keep getting an 'E: Unable to locate package putty' error. I have run both 'sudo apt-get update' and 'sudo apt-get upgrade'. Both complete with success. I have verified that 'main', 'universe', 'restricted', and 'multiverse' are all enabled. But I continue to get the error when trying to install PuTTY. This is the command I'm using 'sudo apt install putty'. Any thoughts on what might be going on?
I was able to finally determine that 16.10 was just too old to update properly. I have moved to 18.04 and successfully installed PuTTY.