[Bug 1987859] Re: sed command in auto install fails in certain circumstance

[Dan Bungert]

** Changed in: subiquity (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1987859

Title:
  sed command in auto install fails in certain circumstance

Status in subiquity package in Ubuntu:
  Incomplete

Bug description:
  If I want to insert or append a line in the `/etc/aliases` file in the
  section `late-commands` from ubuntu auto-install, like the follwoing:

  ```
  late-commands:
    - sed -i '/^postmaster:.*/i root:           root' /target/etc/aliases
  ```

  I will get the following error:

  ```
  finish: subiquity/Late/load_autoinstall_data: {"sed -i -e '/^postmaster:.*/i\\'$'root": "root' /target/etc/aliases"} is not of type 'string', 'array'
  ```

  From the the double quotes it seems, instead of running the complete
  command, the part in front  of the colon will be interpreted as key.
  In this scenario the key:value regex seems to completly negate the
  single quotes of the `sed` command.

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