Public bug reported:
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.
** Affects: ufw (Ubuntu)
Importance: Undecided
Status: New
** Tags: iptables
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https://bugs.launchpad.net/bugs/1377600
Title:
ufw errors after ctr+c interupt
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