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[陈伟琪 <weiqi_chen@xxxxxxxxxxx>]

I try uninstall it harder, and I fond something odd:

(I reinstalled avahi-daemon and rebooted )
(After I rebooted my pc successfully, I did "sudo systemctl stop avahi-daemon.service avahi-daemon.socket"), and then

chen@MSI-Ubuntu:~$ sudo apt-get purge avahi-daemon  
正在读取软件包列表... 完成
正在分析软件包的依赖关系树       
正在读取状态信息... 完成       
下列软件包将被【卸载】：
  avahi-daemon* libnss-mdns*
升级了 0 个软件包，新安装了 0 个软件包，要卸载 2 个软件包，有 0 个软件包未被升级。
解压缩后将会空出 501 kB 的空间。
您希望继续执行吗？ [Y/n] y
(正在读取数据库 ... 系统当前共安装有 339528 个文件和目录。)
正在卸载 libnss-mdns:amd64 (0.10-6) ...
libnss-mdns.postrm: Checking NSS setup...
libnss-mdns.postrm: Removing mdns from NSS setup
正在清除 libnss-mdns:amd64 (0.10-6) 的配置文件 ...
正在卸载 avahi-daemon (0.6.31-4ubuntu4) ...
Warning: Stopping avahi-daemon.service, but it can still be activated by:
  avahi-daemon.socket
正在清除 avahi-daemon (0.6.31-4ubuntu4) 的配置文件 ...
userdel: user avahi is currently used by process 3300
/usr/sbin/deluser："/usr/sbin/userdel avahi"返回错误代码 8，退出。
/usr/sbin/delgroup: "avahi"仍以"avahi"作为他们的首选组!
rmdir: 删除 "/var/run/avahi-daemon" 失败: 目录非空
正在处理用于 libc-bin (2.21-0ubuntu4) 的触发器 ...
正在处理用于 dbus (1.8.12-1ubuntu5) 的触发器 ...
正在处理用于 man-db (2.7.0.2-5) 的触发器 ...
chen@MSI-Ubuntu:~$ cat /var/run/avahi-daemon/
cat: /var/run/avahi-daemon/: 权限不够
chen@MSI-Ubuntu:~$ sudo cat /var/run/avahi-daemon/*
cat: /var/run/avahi-daemon/*: 没有那个文件或目录
chen@MSI-Ubuntu:~$ cd /var/run
chen@MSI-Ubuntu:/var/run$ cd avahi-daemon/
bash: cd: avahi-daemon/: 权限不够
chen@MSI-Ubuntu:/var/run$ sudo su
root@MSI-Ubuntu:/run# cd avahi-daemon/
root@MSI-Ubuntu:/run/avahi-daemon# ls
pid  socket
root@MSI-Ubuntu:/run/avahi-daemon# cat pid 
3299
root@MSI-Ubuntu:/run/avahi-daemon# 


The pid file on /run/avahi-daemon value is 3299 ,

and


root@MSI-Ubuntu:/run/avahi-daemon# ps -aux | grep avahi
avahi     3299  0.0  0.0  30312  3164 ?        Ss   21:26   0:00 avahi-daemon: running [MSI-Ubuntu.local]
avahi     3300  0.0  0.0  30188   240 ?        S    21:26   0:00 avahi-daemon: chroot helper
root      4340  0.0  0.0  11192  2336 pts/0    S+   21:35   0:00 grep --color=auto avahi


So I may think the command "sudo systemctl stop avahi-daemon.service avahi-daemon.socket" not work.
Because It not kill the avahi-daemon process, So I can't remove the package avahi-daemon.

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to avahi in Ubuntu.
https://bugs.launchpad.net/bugs/1502438

Title:
  package avahi-daemon 0.6.31-4ubuntu4 failed to install/upgrade: 子进程
  已安装 pre-removal 脚本 返回错误状态 1

Status in avahi package in Ubuntu:
  New

Bug description:
  正在卸载 avahi-daemon (0.6.31-4ubuntu4) ...
  Job for avahi-daemon.service canceled.
  invoke-rc.d: initscript avahi-daemon, action "stop" failed.
  dpkg: 处理软件包 avahi-daemon (--purge)时出错：
   子进程 已安装 pre-removal 脚本 返回错误状态 1
  update-rc.d: warning: start and stop actions are no longer supported; falling back to defaults
  在处理时有错误发生：
   avahi-daemon
  E: Sub-process /usr/bin/dpkg returned an error code (1)

  ProblemType: Package
  DistroRelease: Ubuntu 15.04
  Package: avahi-daemon 0.6.31-4ubuntu4
  ProcVersionSignature: Ubuntu 3.19.0-28.30-generic 3.19.8-ckt5
  Uname: Linux 3.19.0-28-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.5
  Architecture: amd64
  Date: Sat Oct  3 21:12:04 2015
  DuplicateSignature: package:avahi-daemon:0.6.31-4ubuntu4:子进程 已安装 pre-removal 脚本 返回错误状态 1
  ErrorMessage: 子进程 已安装 pre-removal 脚本 返回错误状态 1
  InstallationDate: Installed on 2014-12-18 (288 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  RelatedPackageVersions:
   dpkg 1.17.25ubuntu1
   apt  1.0.9.7ubuntu4.1
  SourcePackage: avahi
  Title: package avahi-daemon 0.6.31-4ubuntu4 failed to install/upgrade: 子进程 已安装 pre-removal 脚本 返回错误状态 1
  UpgradeStatus: Upgraded to vivid on 2015-04-29 (157 days ago)

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