Drop alternatives - there is no alternative
    
    The previous package will cause warnings when upgrading to this package:
    failed to link /usr/bin/hg -> /etc/alternatives/hg: /usr/bin/hg exists and it is not a symlink
    failed to link /usr/bin/hg-ssh -> /etc/alternatives/hg-ssh: /usr/bin/hg-ssh exists and it is not a symlink