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

[Dan Bungert]

Public bug reported:

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

** Affects: busybox (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: rsyslog (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: rsyslog (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: busybox (Ubuntu)
   Importance: Undecided
       Status: New

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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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