No, because E5´s radio is 3G only, sorry. Which country and which carrier is it?

Telegram latest version works fine on 16.04 RC. Also check below procedure for Dekko. I found this out after googling... https://gitlab.com/doniks/dekko/tags/0.1.6-alpha0

@nikhilbhalwankar Short answer: no Long answer: https://wiki.ubports.com/wiki/Release-Channels The Current Channels 15.04/stable This is the channel you should be on if you're unsure of which to pick. It's the slowest-moving and most vetted release channel. 15.04/rc This channel is a good mix between stability and bleeding edge. We will promote builds to rc from devel when they are possible candidates for stable. This channel should not break, but we can't promise as stable as stable. 15.04/devel This channel will break. If you're working on QA, this is the place to be. If you're trying to use your Ubuntu Touch device in your life, this is not the place to be. Nightly builds from our CI server get pushed straight into 15.04/devel. When they are deemed as candidates for Stable (which only happens after we enter a feature freeze), they are moved to 15.04/rc Again, we do not recommend 15.04/devel for everyday use.