[Bug 1860446] [NEW] man gives wrong information in case of undocumented

[Alexis]

Public bug reported:

When trying to access an undocumented help, the help proposes to use
"man 7 undocumented". Yet this page does not exist on my machine. Base
installation of Ubuntu 18.04.


```
alexis at Oreo:~$ man 2 printf
No manual entry for printf in section 2
See 'man 7 undocumented' for help when manual pages are not available.
alexis at Oreo:~$ man 7 undocumented
No manual entry for undocumented in section 7
```

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: manpages 4.15-1
ProcVersionSignature: Ubuntu 5.3.0-26.28~18.04.1-generic 5.3.13
Uname: Linux 5.3.0-26-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.9
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue Jan 21 15:59:19 2020
Dependencies:
 
InstallationDate: Installed on 2019-08-22 (152 days ago)
InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
PackageArchitecture: all
SourcePackage: manpages
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: apport-bug bionic manpage

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https://bugs.launchpad.net/bugs/1860446

Title:
  man gives wrong information in case of undocumented

Status in manpages package in Ubuntu:
  New

Bug description:
  When trying to access an undocumented help, the help proposes to use
  "man 7 undocumented". Yet this page does not exist on my machine. Base
  installation of Ubuntu 18.04.

  
  ```
  alexis at Oreo:~$ man 2 printf
  No manual entry for printf in section 2
  See 'man 7 undocumented' for help when manual pages are not available.
  alexis at Oreo:~$ man 7 undocumented
  No manual entry for undocumented in section 7
  ```

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: manpages 4.15-1
  ProcVersionSignature: Ubuntu 5.3.0-26.28~18.04.1-generic 5.3.13
  Uname: Linux 5.3.0-26-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.9
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Jan 21 15:59:19 2020
  Dependencies:
   
  InstallationDate: Installed on 2019-08-22 (152 days ago)
  InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
  PackageArchitecture: all
  SourcePackage: manpages
  UpgradeStatus: No upgrade log present (probably fresh install)

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