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[Launchpad Bug Tracker <1377600@xxxxxxxxxxxxxxxxxx>]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: ufw (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1377600

Title:
  ufw errors after ctr+c interupt

Status in “ufw” package in Ubuntu:
  Confirmed

Bug description:
  in ufw.util.get_netfilter_capabilities

  ```
      # Cleanup
      cmd([exe, '-F', chain])
      (rc, out) = cmd([exe, '-X', chain])
      if rc != 0:
          raise OSError(errno.ENOENT, out) # pragma: no cover
  ```

  if the `ufw xxx` command is interrupt by ctrl+c, the cleanup is not called,
  so every ufw cmd afterwards cause error:

  ```
  ERROR: initcaps
  [Errno 2] iptables: Chain already exists.
  ```

  I think we should catch error and cleanup in a finally statement. 
  Or cleanup related rules before ufw init.

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