我的 12.04 系统想要运行部分升级，其中它建议删除某些 MariaDB 包（见下面的屏幕截图）。附件是我的sources.list文件 - 我不明白为什么系统应该建议删除 MariaDB 包，因为我已经明确选择 MariaDB 作为 MySQL 的替代品？
clive@cooler-master:~$ cat /etc/apt/sources.list
# deb cdrom:[Ubuntu 12.04 LTS _Precise Pangolin_ - Release i386 (20120423)]/ precise main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://gb.archive.ubuntu.com/ubuntu/ precise main restricted
deb-src http://gb.archive.ubuntu.com/ubuntu/ precise main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://gb.archive.ubuntu.com/ubuntu/ precise-updates main restricted
deb-src http://gb.archive.ubuntu.com/ubuntu/ precise-updates main restricted
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://gb.archive.ubuntu.com/ubuntu/ precise universe
deb-src http://gb.archive.ubuntu.com/ubuntu/ precise universe
deb http://gb.archive.ubuntu.com/ubuntu/ precise-updates universe
deb-src http://gb.archive.ubuntu.com/ubuntu/ precise-updates universe
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://gb.archive.ubuntu.com/ubuntu/ precise multiverse
deb-src http://gb.archive.ubuntu.com/ubuntu/ precise multiverse
deb http://gb.archive.ubuntu.com/ubuntu/ precise-updates multiverse
deb-src http://gb.archive.ubuntu.com/ubuntu/ precise-updates multiverse
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://gb.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse
deb-src http://gb.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu precise-security main restricted
deb-src http://security.ubuntu.com/ubuntu precise-security main restricted
deb http://security.ubuntu.com/ubuntu precise-security universe
deb-src http://security.ubuntu.com/ubuntu precise-security universe
deb http://security.ubuntu.com/ubuntu precise-security multiverse
deb-src http://security.ubuntu.com/ubuntu precise-security multiverse
## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
deb http://archive.canonical.com/ubuntu precise partner
# deb-src http://archive.canonical.com/ubuntu precise partner
## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
deb http://extras.ubuntu.com/ubuntu precise main
deb-src http://extras.ubuntu.com/ubuntu precise main
# MariaDB 5.5 repository list - created 2012-09-21 09:23 UTC
# http://downloads.mariadb.org/mariadb/repositories/
deb http://ftp.heanet.ie/mirrors/mariadb/repo/5.5/ubuntu precise main
deb-src http://ftp.heanet.ie/mirrors/mariadb/repo/5.5/ubuntu precise main
# deb http://repository.spotify.com stable non-free
deb http://deb.opera.com/opera/ stable non-free
deb http://ppa.launchpad.net/yorba/ppa/ubuntu precise main
deb-src http://ppa.launchpad.net/yorba/ppa/ubuntu precise main
答案1
如果您尝试 dist-upgrade（似乎是这样？），它可能来自 Ubuntu 在升级到较新版本时注释掉外部存储库。除此之外，不应该发生 MariaDB 自动卸载（如果它不是作为依赖项安装的）的事件。
答案2
MariaDB 在安装 deb 软件包的文章中介绍了这个问题，解决这个问题的最佳方法是固定 MariaDB 仓库。您可以按照以下说明进行操作：https://mariadb.com/kb/en/installing-mariadb-deb-files/#pinning-the-mariadb-repository（如果你向上滚动他们还会解释为什么会发生这种情况）