** Also affects: command-not-found (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Also affects: command-not-found (Ubuntu Eoan)
   Importance: Undecided
       Status: New

** Also affects: command-not-found (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Description changed:

+ [Impact]
+ In zsh, typing a command that is unknown to command-not-found does not 
trigger a command not found message, but does nothing. If your command were 
silent, you might think it was executed.
+ 
+ [Test case]
+ 
+ Type a command in zsh that command-not-found does not know about, and
+ check there is an error message that says command not found.
+ 
+ [Regression potential]
+ 
+ Given that this only affects a cnf handler, any regressions that could
+ arise would be confined to that.
+ 
+ There should not be any regressions, as anything that would regress now
+ should have also regressed when zsh itself changed behavior and caused
+ this bug.
+ 
+ [Original bug report]
+ 
  - Using latest Ubuntu Bionic, full updated.
  
  - Using Zsh.
  
  My ~/.zshrc includes the following line:
  
-   . /etc/zsh_command_not_found
+   . /etc/zsh_command_not_found
  
  When I type (for example):
  
-   $ sdlkfjslkdfjkdslf
+   $ sdlkfjslkdfjkdslf
  
  it doesn't say nothing. No error message.
  
  If I change the line #11 of /etc/zsh_command_not_found and I remove
  '--no-failure-msg' option, then it works OK:
  
-   /usr/lib/command-not-found -- ${1+"$1"} && : (line 11, without --no-
+   /usr/lib/command-not-found -- ${1+"$1"} && : (line 11, without --no-
  failure-msg option)
  
  I think the above option should be removed from
  /etc/zsh_command_not_found.

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https://bugs.launchpad.net/bugs/1766068

Title:
  Using Zsh, it doesn't show an error message when command not found

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