package mysql-server-8.0 8.0.26-0ubuntu0.20.04.2 failed to install/upgrade: 已安装 mysql-server-8.0 软件包 pre-removal 脚本 子进程返回错误状态 1

[Epro Fymed]

I can't remove the things that I downloaded from 'apt install mysql-server'

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: mysql-server-8.0 8.0.26-0ubuntu0.20.04.2
ProcVersionSignature: Ubuntu 5.11.0-27.29~20.04.1-generic 5.11.22
Uname: Linux 5.11.0-27-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckResult: skip
Date: Tue Aug 17 18:48:02 2021
ErrorMessage: 已安装 mysql-server-8.0 软件包 pre-removal 脚本 子进程返回错误状态 1
InstallationDate: Installed on 2021-03-06 (163 days ago)
InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)
Logs.var.log.daemon.log:

MySQLConf.etc.mysql.conf.d.mysql.cnf: [mysql]
MySQLConf.etc.mysql.conf.d.mysqldump.cnf:
 [mysqldump]
 quick
 quote-names
 max_allowed_packet = 16M
MySQLConf.etc.mysql.my.cnf: Error: [Errno 40] 符号连接的层数过多: '/etc/mysql/my.cnf'
MySQLVarLibDirListing: ['moha', 'aria_log.00000001', 'mysql', 'ibdata1', 'ib_logfile1', 'ib_logfile0', 'mysql_upgrade_info', 'performance_schema', 'debian-10.3.flag', 'ib_buffer_pool', 'aria_log_control', 'multi-master.info']
ProcCmdline: BOOT_IMAGE=/boot/vmlinuz-5.11.0-27-generic root=UUID=21f4dc5c-4b29-4062-aeee-4c7fc777a12f ro quiet splash vt.handoff=7
Python3Details: /usr/bin/python3.8, Python 3.8.10, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: /usr/bin/python2.7, Python 2.7.18, python-is-python2, 2.7.17-4
RelatedPackageVersions:
 dpkg 1.19.7ubuntu3
 apt 2.0.6
SourcePackage: mysql-8.0
Title: package mysql-server-8.0 8.0.26-0ubuntu0.20.04.2 failed to install/upgrade: 已安装 mysql-server-8.0 软件包 pre-removal 脚本 子进程返回错误状态 1
UpgradeStatus: No upgrade log present (probably fresh install)

[Sergio Durigan Junior (sergiodj)]

Thank you for taking the time to file a bug report.

The first thing I tried was to translate the error messages you posted, which seem to be in Chinese. I found out that one of the errors is:

MySQLConf.etc.mysql.my.cnf: Error: [Errno 40] Too many layers of symbolic links:'/etc/mysql/my.cnf'

This raised a flag for me, because /etc/mysql/my.cnf is not supposed to be a symbolic link by default.

Then, I looked at the log files that are attached to the bug. From the DpkgHistoryLog.txt it seems that you installed mysql-server first, then tried installing mariadb-server right after. Unfortunately this is not going to work, because both packages share files. In order to fully remove mysql-server, you need to run:

# apt-get purge mysql-server

I would also recommend you to investigate why your /etc/mysql/my.cnf file is a symbolic link, and perhaps even remove it before installing mariadb-server (if that's what you want to do, of course).

Since it seems likely to me that this is a local configuration problem,
rather than a bug in Ubuntu, I am marking this bug as 'Incomplete'.

However, if you believe that this is really a bug in Ubuntu, then we would
be grateful if you would provide a more complete description of the problem
with steps to reproduce, explain why you believe this is a bug in Ubuntu
rather than a problem specific to your system, and then change the bug
status back to "New".

For local configuration issues, you can find assistance here:
http://www.ubuntu.com/support/community

[Launchpad Janitor (janitor)]

[Expired for mysql-8.0 (Ubuntu) because there has been no activity for 60 days.]