propellor (3.0.0-1) unstable; urgency=medium This version of Propellor introduces a new dependency on the concurrent-output Haskell library. If you were using a version of Propellor older than 2.17.2 when you last ran propellor --spin to spin any of your hosts, running propellor --spin on those hosts with Propellor version 3.0.0 will fail to install the dependency and so the spin will fail. To deal with this, login as root to each of the hosts that were last spun with a version older than 2.17.2, and execute the following commands: cd /usr/local/propellor make clean For a full explanation of why this is necessary, see . For a guide to upgrading your config.hs for Propellor version 3, see . -- Sean Whitton Sun, 03 Apr 2016 11:35:35 -0700