[Bug 1808251] [NEW] systemctl disable fails to clean up override

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I am using Ubuntu 16.04.4 LTS  and package version

systemd:
  Installed: 229-4ubuntu21.10
  Candidate: 229-4ubuntu21.10
  Version table:
 *** 229-4ubuntu21.10 500
        500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages
        100 /var/lib/dpkg/status
     229-4ubuntu4 500
        500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages


When a unit is enabled with 

    systemctl enable <unit file>

and overrides are applied with

    systemctl edit <unit name>

and subsequently the unit is disabled with

    systemctl disable <unit name>

the override file that is created and its directory

    /etc/systemd/system/<unit name>.d/override.conf

is not removed.  Subsequent attempts to enable the same unit will fail
with the misleading and unhelpful error message

    Failed to execute operation: Invalid argument

Removing the override file and directory will fix the problem.

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

-- 
systemctl disable fails to clean up override
https://bugs.launchpad.net/bugs/1808251
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