[Bug 1771802] [NEW] enable rc-local.service unit by default

[Matthew Hawkins]

Public bug reported:

Every other systemd-infected distribution leaves the rc-local.service
unit enabled; this is probably because provisioning systems need to use
it to launch first-boot tasks.

Ubuntu has been blindly following suit in every other respect and should
do the same here also.  It's a null op unless the file exists and is
executable, so enabling it gives all the benefits for extremely
negligible cost.

Example reproducable bug:
* preseed a new host and an rc.local expected to run on boot
* boot and realise rc.local didn't run
* realise you can't enable it in the preseed as systemctl is not affecting the target system
* curse Lennart (again) and run Devuan instead where things just work as they should

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

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https://bugs.launchpad.net/bugs/1771802

Title:
  enable rc-local.service unit by default

Status in systemd package in Ubuntu:
  New

Bug description:
  Every other systemd-infected distribution leaves the rc-local.service
  unit enabled; this is probably because provisioning systems need to
  use it to launch first-boot tasks.

  Ubuntu has been blindly following suit in every other respect and
  should do the same here also.  It's a null op unless the file exists
  and is executable, so enabling it gives all the benefits for extremely
  negligible cost.

  Example reproducable bug:
  * preseed a new host and an rc.local expected to run on boot
  * boot and realise rc.local didn't run
  * realise you can't enable it in the preseed as systemctl is not affecting the target system
  * curse Lennart (again) and run Devuan instead where things just work as they should

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