Debian軟件包不提供？

我有以下2包（定製）：Debian軟件包不提供？

**apt-cache show libmysqlclient18** 


Package: libmysqlclient18 
Section: libs 
Installed-Size: 4194 
Architecture: amd64 
Version: 5.6.27 
Depends: mysql-common (>= 5.6.27) 
Filename: ./libmysqlclient18.deb 
Size: 1167158 
MD5sum: cf4a5d292456375c4099b11f5ee6270d 
SHA1: e9c4f185bed358e5dda908555686b2884d341772 
SHA256: 3092f2af61493bd8e75503568ff622ce1dd81a9ce04aa072d28c336092835e8f 
SHA512: e0ffcf7cd48f230225fb48bf5fee8968f1e4006c581529b196a27bff06257fe1da55e80434af0e2e58d2805156da37c44d7994a5af233e8942ecc6d99d680117 
Description-en: MySQL database client library 
MySQL is a fast, stable and true multi-user, multi-threaded SQL database 
server. SQL (Structured Query Language) is the most popular database query 
language in the world. The main goals of MySQL are speed, robustness and 
ease of use. 
. 
This package includes the client library.

及以下：嘗試安裝libmysqlclient20時

**dpkg --info libmysqlclient20.deb** 


new debian package, version 2.0. 
size 1429220 bytes: control archive=909 bytes. 
    768 bytes, 18 lines  control 
     72 bytes,  1 lines  md5sums 
    268 bytes, 15 lines * postinst    #!/bin/bash 
    139 bytes,  7 lines * postrm    #!/bin/sh 
     45 bytes,  0 lines  shlibs 
Package: libmysqlclient20 
Architecture: amd64 
Version: 5.7.9 
Section: libs 
Depends: mysql-common (>= 5.7.9) 
Provides: libmysqlclient15, libmysqlclient18 
Conflicts: libmysqlclient15, libmysqlclient18 
Replaces: libmysqlclient15, libmysqlclient18 
Installed-Size: 4565 
Description: MySQL shared client libraries 
    The MySQL(TM) software delivers a very fast, multi-threaded, multi-user, 
    and robust SQL (Structured Query Language) database server. MySQL Server 
    is intended for mission-critical, heavy-load production systems as well 
    as for embedding into mass-deployed software. MySQL is a trademark of 
    Oracle. This package contains the shared libraries for MySQL client 
    applications.

現在，我得到不是有關相關警告的LOT滿足：

Reading package lists... Done 
Building dependency tree 
Reading state information... Done 
dovecot-mysql is already the newest version. 
libdbd-mysql-perl is already the newest version. 
libdbd-mysql-perl set to manually installed. 
libmailutils4 is already the newest version. 
mailutils is already the newest version. 
mailutils set to manually installed. 
libqt4-sql-mysql is already the newest version. 
libqt4-sql-mysql set to manually installed. 
php5-mysql is already the newest version. 
php5-mysql set to manually installed. 
zabbix-server-mysql is already the newest version. 
You might want to run 'apt-get -f install' to correct these: 
The following packages have unmet dependencies: 
dovecot-mysql : Depends: libmysqlclient18 (>= 5.5.24+dfsg-1) 
libdbd-mysql-perl : Depends: libmysqlclient18 (>= 5.5.24+dfsg-1) 
libmailutils4 : Depends: libmysqlclient18 (>= 5.5.24+dfsg-1) 
libqt4-sql-mysql : Depends: libmysqlclient18 (>= 5.5.24+dfsg-1) 
mailutils : Depends: libmysqlclient18 (>= 5.5.24+dfsg-1) 
php5-mysql : Depends: libmysqlclient18 (>= 5.5.24+dfsg-1) 
zabbix-server-mysql : Depends: libmysqlclient18 (>= 5.5.24+dfsg-1) 
         Recommends: snmptt but it is not going to be installed 
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

我無法理解的是，我沒有提供在控制文件中的「提供」頭，以及一個「替換」 heade河當我說新軟件包提供了libmysqlclient18時，它怎麼可能會選擇忽略它呢？

（並且當我想要執行apt-get -f install時，它想要刪除libmysqlclient20並重新安裝libmysqlclient18）。

有人會知道我在這裏失蹤了嗎？

謝謝！

來源

2015-11-01 Steven Van Ingelgem