Comment 7 for bug 1052605

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Michael Vogt (mvo) wrote : Re: ERROR:root:getListFromFile: no '/usr/share/update-manager/removal_blacklist.cfg' found: exception during Precise to Quantal upgrade on amd64+mac

This means:
1. when updating sources.list but not installing any packages it should revert the system state again
2. when the lock is taken it should at either show a message or keep spinning on it for some seconds at least