System Information
Ubuntu 16.04 LTS
Geforce GTX 670
Blender Version
Broken: 2.79
Worked: 2.78c
Short description of error
Armature flip names function fail to cleanup the names. It keep the duplication number at the end.
Exact steps for others to reproduce the error
create an armature. create bones on the left side and use Autoname Left/right from Armature menu.
Select the side bones on front view viewport then duplicate, scale X -1 from the centred 3d cursor.
Use Flip names from Armature menu.
You get names like Bone.001.R.001 instead of Bone.001.R