As Diodon has some dependencies not available per default in Lucid there was so far no package for it. However as Lucid is a LTS version and some user would still like to use Diodon on their machine I have some great news from you ;):

After some dependency fiddling and adjusting code a new Diodon version 0.3.1 is available which can now be built on Lucid as well (Note: ppa:sao/backports is needed however).

Find a package in the official Diodon ppa.