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Hi,

Horizon seems to use python-selenium. The problem is that, in Debian,
this package is in the non-free repository. So I strongly suggest to not
use it for Havana. That otherwise would put Horizon into the contrib
repository of Debian (eg: not officially in Debian), or eventually,
remove any possibility to run the unit tests, which isn't nice.

Cheers,

Thomas Goirand (zigo)