The etckeeper post-install command that fails is run at the very end of the apt run (here, at the very end of the update) so that should not leave things in a broken state. It just fails to commit the /etc changes in the etckeeper bzr repository. As the previous commenter said, doing "sudo etckeeper commit 'I just upgraded'" should be enough. Subsequent updates should be just alright.
The etckeeper post-install command that fails is run at the very end of the apt run (here, at the very end of the update) so that should not leave things in a broken state. It just fails to commit the /etc changes in the etckeeper bzr repository. As the previous commenter said, doing "sudo etckeeper commit 'I just upgraded'" should be enough. Subsequent updates should be just alright.