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Re: libc-bin "cycle found while processing triggers"

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On 6/16/20 6:03 AM, Dan Ritter wrote:
> Gary Aitken wrote:
>> On 6/15/20 3:37 PM, Dan Ritter wrote:
>>> Gary Aitken wrote:
>> ...
>>>> When originally built, the system had a screwed-up postfix installation;
>>>> in attempting to solve this problem, I wanted to uninstall postfix and
>>>> reinstall it.  However, I don't think I should do that because the postfix
>>>> installation has an issue:
>>>>
>>>> $ aptitude why postfix
>>>> i   automysqlbackup Depends  bsd-mailx | mailx
>>>> i A bsd-mailx       Depends  default-mta | mail-transport-agent
>>>> i A postfix         Provides mail-transport-agent
>>>>
>>>> Can anyone give me some clues on how to resolve this?
>>>
>>>> The main goal is to uninstall postfix and re-install it, without uninstalling
>>>> the automysqlbackup as this is a production system and the autobackup is
>>>> working properly.  I believe the postfix dependency is for cases where the
>>>> auto-backup fails; it's also preventing mail from being delivered for failing
>>>> cron jobs.
>>>
>>> sudo apt install --reinstall postfix
>>>
>>> sudo dpkg-reconfigure postfix
>>>
>>> might do what you want. In general, Debian derivatives will try
>>> to prevent you from uninstalling critical machinery, like libc.
>>
>> I've already tried reconfiguring and reinstalling postfix, to no avail.
> 
> Yes, but did apt install --reinstall help?

The reason I think I need to do a purge is the conf files are what is screwed
up (I think), and a reinstall doesn't mess with them:

# apt install --reinstall postfix
...
Setting up postfix (3.1.0-3ubuntu0.3) ...

Postfix configuration was untouched.  If you need to make changes, edit
/etc/postfix/main.cf (and others) as needed.  To view Postfix configuration
values, see postconf(1).

After modifying main.cf, be sure to run '/etc/init.d/postfix reload'.

Running newaliases
Job for postfix.service failed because the control process exited with error code. See "systemctl status postfix.service" and "journalctl -xe" for details.
invoke-rc.d: initscript postfix, action "restart" failed.
● postfix.service - LSB: Postfix Mail Transport Agent
    Loaded: loaded (/etc/init.d/postfix; bad; vendor preset: enabled)
   Drop-In: /run/systemd/generator/postfix.service.d
            └─50-postfix-$mail-transport-agent.conf
    Active: failed (Result: exit-code) since Tue 2020-06-16 14:50:45 UTC; 11ms ago
      Docs: man:systemd-sysv-generator(8)
   Process: 18523 ExecStart=/etc/init.d/postfix start (code=exited, status=1/FAILURE)

Jun 16 14:50:43 xblgx-ops systemd[1]: Stopped LSB: Postfix Mail Transport Agent.
Jun 16 14:50:43 xblgx-ops systemd[1]: Starting LSB: Postfix Mail Transport Agent...
Jun 16 14:50:43 xblgx-ops postfix[18523]:  * Starting Postfix Mail Transport Agent postfix
Jun 16 14:50:44 xblgx-ops postfix[18615]: fatal: bad string length 0 < 1: mailq_path =
Jun 16 14:50:45 xblgx-ops postfix[18523]:    ...fail!
Jun 16 14:50:45 xblgx-ops systemd[1]: postfix.service: Control process exited, code=exited status=1
Jun 16 14:50:45 xblgx-ops systemd[1]: Failed to start LSB: Postfix Mail Transport Agent.
Jun 16 14:50:45 xblgx-ops systemd[1]: postfix.service: Unit entered failed state.
Jun 16 14:50:45 xblgx-ops systemd[1]: postfix.service: Failed with result 'exit-code'.
dpkg: error processing package postfix (--configure):
  subprocess installed post-installation script returned error exit status 1
E: Sub-process /usr/bin/dpkg returned an error code (1)

Unfortunately, I don't see a way to do the equivalent of purge --reinstall
and ignore the dependencies so automysqlbackup is left intact:

$ apt --simulate purge --reinstall postfix
...
The following packages will be REMOVED:
   automysqlbackup* bsd-mailx* postfix*
0 upgraded, 0 newly installed, 3 to remove and 140 not upgraded.
1 not fully installed or removed.
Purg automysqlbackup [2.6+debian.4-1]
Purg bsd-mailx [8.1.2-0.20160123cvs-2]
Purg postfix [3.1.0-3ubuntu0.3]

$  apt --simulate --ignore-depends bsd-mailx purge --reinstall postfix
E: Command line option --ignore-depends is not understood in combination with the other options

Gary

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Thread

libc-bin "cycle found while processing triggers" Gary Aitken <debian@dreamchaser.org> - 2020-06-15 22:50 +0200
  Re: libc-bin "cycle found while processing triggers" Dan Ritter <dsr@randomstring.org> - 2020-06-15 23:40 +0200
    Re: libc-bin "cycle found while processing triggers" Gary Aitken <debian@dreamchaser.org> - 2020-06-16 04:00 +0200
      Re: libc-bin "cycle found while processing triggers" Dan Ritter <dsr@randomstring.org> - 2020-06-16 14:10 +0200
        Re: libc-bin "cycle found while processing triggers" Gary Aitken <debian@dreamchaser.org> - 2020-06-16 17:30 +0200
          Re: libc-bin "cycle found while processing triggers" Dan Ritter <dsr@randomstring.org> - 2020-06-16 17:50 +0200
            Re: libc-bin "cycle found while processing triggers" Gary Aitken <debian@dreamchaser.org> - 2020-06-17 00:40 +0200
            Re: libc-bin "cycle found while processing triggers" Andrei POPESCU <andreimpopescu@gmail.com> - 2020-06-17 07:40 +0200
  Re: libc-bin "cycle found while processing triggers" Kenneth Parker <sea7kenp@gmail.com> - 2020-06-15 23:50 +0200
    Re: libc-bin "cycle found while processing triggers" Gary Aitken <debian@dreamchaser.org> - 2020-06-16 03:50 +0200
      Re: libc-bin "cycle found while processing triggers" Kenneth Parker <sea7kenp@gmail.com> - 2020-06-16 06:10 +0200

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