A Unity ID allows you to buy and/or subscribe to Unity products and services, shop in the Asset Store and participate
in the Unity community.
Same here on Ubuntu 15.10. Tried Unity versions 5.3.2, 5.3.3, 5.4.0.
Devs, any news on this issue? It has been a month since first reported.
UnityYAMLMerge doesn't work for me on Ubuntu 15.10.
Here is the output I get:
$ git mergetool --tool=unityyamlmerge