Hi Stefan.
In breif py26-compat-... is used to build salt-thin tarball to be deployed on salt-ssh managed system as a compatibility for python 2.6 if the system you are managing with salt-ssh has no Python 3 installed. There is also py27-compat... for systems with Python 2.7 which can run salt 3000.3 as it's compatible with python 2.7
These packages also required for bootstrapping normal (non-ssh) minions with web UI.
Victor
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From: Stefan Bluhm