[Bug 1683713] [NEW] Cannot install on ubuntu 14.04

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Public bug reported:

Hello

I try to install `ttf-mscorefonts-installer` package, which depends of your `update-notifier-common` package on ubuntu 14.04 and it failed cause 
```
update-notifier-common : Depends: update-manager-core (>= 1:0.196.23) but it is not going to be installed
```

I reproduce a problem with minimal Dockerfile

```
FROM ubuntu:14.04
RUN apt-get -y update && apt-get install -y update-notifier-common
```

Seems this error start to happened yesterday

** Affects: update-notifier (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1683713

Title:
  Cannot install on ubuntu 14.04

Status in update-notifier package in Ubuntu:
  New

Bug description:
  Hello

  I try to install `ttf-mscorefonts-installer` package, which depends of your `update-notifier-common` package on ubuntu 14.04 and it failed cause 
  ```
  update-notifier-common : Depends: update-manager-core (>= 1:0.196.23) but it is not going to be installed
  ```

  I reproduce a problem with minimal Dockerfile

  ```
  FROM ubuntu:14.04
  RUN apt-get -y update && apt-get install -y update-notifier-common
  ```

  Seems this error start to happened yesterday

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