[Bug 2026292] Re: conflict on syslog.service when moving between rsyslog and busybox-syslogd

[Dan Bungert]

** Attachment added: "syslog-service-conflict"
   https://bugs.launchpad.net/ubuntu/+source/busybox/+bug/2026292/+attachment/5684334/+files/syslog-service-conflict

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https://bugs.launchpad.net/bugs/2026292

Title:
  conflict on syslog.service when moving between rsyslog and busybox-
  syslogd

Status in busybox package in Ubuntu:
  New
Status in rsyslog package in Ubuntu:
  New
Status in systemd package in Ubuntu:
  New

Bug description:
  Suppose a system with systemd 252 and rsyslog installed.  Install
  busybox-syslogd version 1:1.36.1-3ubuntu1, which will cause rsyslog to
  be removed (but not purged).  The install of busybox-syslogd will fail
  as follows:

  Failed to preset unit, file "/etc/systemd/system/syslog.service"
  already exists and is a symlink to
  "/lib/systemd/system/rsyslog.service".

  The failure can also be seen in the reverse direction - busybox-
  syslogd 1:1.36.1-3ubuntu1 installed, then install rsyslog.

  With systemd 253, we instead see:
  Removed "/etc/systemd/system/syslog.service".

  Workarounds:
  * use systemd 253 when available
  * purge the existing system-log-daemon before installing the new one

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