Hello, I don't know whether that helps, but:
> E: Version '0.8.10-1' for 'python-waitress' was not found That version of python-waitress is in the Ubuntu repositories: http://packages.ubuntu.com/xenial/python-waitress I'm actually on Ubuntu 16.04, and I experience the same error since about one week. Curiously, there was no update for vim-youcompleteme or ycmd in the last days that would have caused this problem, so it must be related to some other package. However, on Ubuntu 16.04 there was also no update of python-waitress recently that could have caused the problem. It used to work with version 0.8.10-1, but now with the same version it causes the KeyError problem.
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