Ubuntu daily builds are broken due to hg-git import
Canonical/Ubuntu's launchpad was importing this repo on daily basis and creating packages for Ubuntu based distros
https://code.launchpad.net/~pythonxy/+archive/ubuntu/pythonxy-devel/+packages?field.name_filter=pandas

This run well for many years until recently some changes in the repo broke the chain:

> > The problem is that the Git repository was imported from Mercurial, and recent versions of hg-git >>add some >non-standard commit headers that bzr-git doesn't support, and it isn't clear how they >>should be supported.
> 
> They must have recently merged a branch that was created by a new version of hg-git.

Please have a look to a discussion with a Launchpad developer here:
https://answers.launchpad.net/launchpad/+question/264432

Is there anything the maintainers could do to fix this issue?

Else, we would have to wait until Launchpad supports git directly.
