[Bug 1769088] Re: Incorrect message if /snap/bin is not in PATH

[Łukasz Zemczak]

Since this also basically refreshes the db's, I would like the package
verification to include some arbitrary dogfooding of command-not-found
for various deb-based applications.

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https://bugs.launchpad.net/bugs/1769088

Title:
  Incorrect message if /snap/bin is not in PATH

Status in command-not-found package in Ubuntu:
  Fix Released
Status in command-not-found source package in Bionic:
  Fix Committed

Bug description:
  [Impact] 
   * Usability of snap recommendations degrated

  [Test Case]
   1. Remove /snap/bin from PATH
   2. snap install corebird
   3. run "corebird"
   4. observe command-not-found suggesting to install corebird

   5. install fixed c-n-f
   6. observe that c-n-f suggests to run corebird from /snap/bin

  
  [Regression Potential] 
   * very low

  
  [ORIGINAL REPORT]

  When the user installs a snap (like slack) but does not have /snap/bin in PATH the message is very confusing:
  ```
  $ sudo snap install slack
  ...
  $ slack

  Command 'slack' not found, but can be installed with:
  sudo apt  install slack
  ```

  The fix is that /snap/bin needs to be considered by c-n-f so that it can say:
  ```
  command 'slack' is available in '/snap/bin/slack'
  The command could not be located because '/snap/bin' is not included in the PATH environment variable.
  slack: command not found
  ```

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