如何知道一個過時的包是否被另一個包替換？

在安裝mysql-serverraspbian buster 期間，apt說它mysql-server不可用並建議mariadb-server-10.0作為替代品。

如何apt知道一個包是否被另一個包替換？換句話說，在包創建過程中應該在哪裡設置這些資訊？

Package mysql-server is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
 mariadb-server-10.0

E: Package 'mysql-server' has no installation candidate

如果你執行apt show mariadb-server-10.3（我有更新版本），你會看到：

Package: mariadb-server-10.3
Version: 1:10.3.27-0+deb10u1
Priority: optional
Section: database
Source: mariadb-10.3
Maintainer: Debian MySQL Maintainers <pkg-mysql-maint@lists.alioth.debian.org>
Installed-Size: 66,6 MB
Provides: virtual-mysql-server
Pre-Depends: adduser (>= 3.40), debconf, mariadb-common (>= 1:10.3.27-0+deb10u1)
Depends: galera-3 (>= 25.3), gawk, iproute2, libdbi-perl, lsb-base (>= 3.0-10), lsof, mariadb-client-10.3 (>= 1:10.3.27-0+deb10u1), mariadb-server-core-10.3 (>= 1:10.3.27-0+deb10u1), passwd, perl (>= 5.6), psmisc, rsync, socat, debconf (>= 0.5) | debconf-2.0, libc6 (>= 2.28), libgnutls30 (>= 3.6.6), libpam0g (>= 0.99.7.1), libstdc++6 (>= 5.2), zlib1g (>= 1:1.2.0)
Recommends: libhtml-template-perl
Suggests: mailx, mariadb-test, netcat-openbsd, tinyca
Conflicts: mariadb-tokudb-engine-10.0, mariadb-tokudb-engine-10.1, mariadb-tokudb-engine-5.5, mysql-server-core-5.5, mysql-server-core-5.6, mysql-server-core-5.7, virtual-mysql-server
Breaks: cqrlog (<< 1.9.0-5~), mariadb-galera-server, mariadb-galera-server-10.0, mariadb-galera-server-5.5, mariadb-server-10.0, mariadb-server-10.1, mariadb-server-10.2, mariadb-server-5.5, mariadb-tokudb-engine-10.0, mariadb-tokudb-engine-10.1, mariadb-tokudb-engine-5.5, mysql-client-5.5, mysql-server-5.5, mysql-server-5.6, mysql-server-5.7
Replaces: mariadb-galera-server, mariadb-galera-server-10.0, mariadb-galera-server-5.5, mariadb-server-10.0, mariadb-server-10.1, mariadb-server-10.2, mariadb-server-5.5, mariadb-tokudb-engine-10.0, mariadb-tokudb-engine-10.1, mariadb-tokudb-engine-5.5, mysql-client-5.5, mysql-server-5.5, mysql-server-5.6, mysql-server-5.7, virtual-mysql-server
Homepage: https://mariadb.org/
Download-Size: 4 202 kB
APT-Manual-Installed: no
APT-Sources: http://ftp.cz.debian.org/debian buster/main amd64 Packages
Description: MariaDB database server binaries
MariaDB 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 MariaDB are speed, robustness and
ease of use.
.
This package includes the server binaries.

以開頭的行Replaces:列出了這個可以替換的包。

引用自：https://unix.stackexchange.com/questions/631210