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I've went to the page for the Nexus 5 and there isn't a link to the wiki page for MultiRom
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I have found help here : https://forum.xda-developers.com/google-nexus-5/general/port-ubuntu-touch-nexus-5-t2594874/page59
It's not difficult. It works with Android and Cyanogenmod.
If you do it, take some note and please write it on the wiki or on the forum asking for help to edit the wiki. That would help others.