Debian Policy Manual 的第7.4和7.6.1节描述了将 Debian 软件包一分为二的正确方法。但是，我有一个更复杂的情况。
我目前有两个包，例如版本 1.2.3：
Package: foo-base
Package: foo-dbserver
Depends: foo-base (>= 1.2.3)
最初，这种关系是有道理的，但随着时间的推移，有些偶然，foo-base的元素已经开始依赖于foo-dbserver 的元素。更糟糕的是，现实情况是foo-base Pre- 的元素依赖于foo-dbserver 的元素。所以我现在想要的是将foo-base拆分为foo-essential和foo-base，如下所示，对于 1.2.4 版本：
Package: foo-essential
Replaces: foo-base (<< 1.2.3)
Breaks: foo-base (<< 1.2.3)
Package: foo-dbserver
Depends: foo-essential (>= 1.2.4)
Package: foo-base
Pre-Depends: foo-dbserver (>= 1.2.4)
这三个软件包在新安装时安装得很好，但它们并没有完全升级：
dpkg: regarding foo-base_1.2.4_all.deb containing foo-base, pre-dependency problem:
foo-base pre-depends on foo-dbserver (>= 1.2.4)
foo-dbserver latest configured version is 1.2.3
dpkg: error processing foo-base_1.2.4_all.deb (--install):
pre-dependency problem - not installing foo-base
dpkg: regarding foo-essential_1.2.4_all.deb containing foo-essential:
foo-essential breaks foo-base (<< 1.2.3)
foo-base (version 1.2.3) is present and installed.
dpkg: error processing foo-essential_1.2.4_all.deb (--install):
installing foo-essential would break foo-base, and
deconfiguration is not permitted (--auto-deconfigure might help)
(Reading database ... 39107 files and directories currently installed.)
Preparing to replace foo-dbserver 1.2.3 (using foo-dbserver_1.2.4_all.deb) ...
Unpacking replacement foo-dbserver ...
dpkg: dependency problems prevent configuration of foo-dbserver:
foo-dbserver depends on foo-essential (>= 1.2.4); however:
Package foo-essential is not installed.
dpkg: error processing foo-dbserver (--install):
dependency problems - leaving unconfigured
Errors were encountered while processing:
foo-base_1.2.4_all.deb
foo-essential_1.2.4_all.deb
foo-dbserver
有没有办法正确表达这种关系，以便升级？将 foo-base 完全重命名为其他名称（并使用名称foo-essential、foo-dbserver、foo-base2）是更好的解决方案吗？