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Debian政策手冊中的7.4和7.6.1部分描述了將Debian軟件包分爲兩部分的正確方法。但是，我有一個更復雜的情況。如何拆分現有的Debian軟件包，使其中一個新軟件包預先依賴於另一個軟件包？
我現在有兩個包，在，比方說，版本1.2.3：
Package: foo-base
Package: foo-dbserver
Depends: foo-base (>= 1.2.3)
最初，這relationsihp是有道理的，但隨着時間的推移，和有點意外的富基元素有來取決於foo-dbserver的元素。更糟的是，現實情況是foo-base需要先取得元素foo-dbserver。所以我現在想要的是富基，分成富必要和富基如下的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)
這三個包上新安裝高高興興地安裝，但它們並沒有乾淨地升級：
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
有沒有一種方法可以正確表達這種關係，從而可以進行升級？完全將foo-base重命名爲別的東西（並且使用名稱foo-essential,foo-dbserver,foo-base2）是一個更好的解決方案嗎？