Public bug reported:

Background:
In Emacs, I had customized backup-directory-alist to (("." . ".~"))
Then, when I edited /etc/apt/apt.conf.d/10periodic, it created a backup file 
named /etc/apt/apt.conf.d/.~/10periodic~

The problem: today when I changed proxy settings in the network applet and 
tried to apply them system wide, it failed silently.  Eventually I had the idea 
of starting unity-control-center in a terminal to see its error messages.  I 
got the messages such as:
(unity-control-center:5448): network-cc-panel-WARNING **: Error while calling 
set_proxy for http protocol: 
GDBus.Error:org.freedesktop.DBus.Python.IsADirectoryError: Traceback (most 
recent call last):
  File "/usr/lib/python3/dist-packages/dbus/service.py", line 707, in 
_message_cb
    retval = candidate_method(self, *args, **keywords)
  File "/usr/lib/python3/dist-packages/UbuntuSystemService/backend.py", line 
232, in set_proxy
    res = self._write_apt_proxy(proxy_type, new_proxy)
  File "/usr/lib/python3/dist-packages/UbuntuSystemService/backend.py", line 
149, in _write_apt_proxy
    open(f,"w").write("".join(new_content))
IsADirectoryError: [Errno 21] Is a directory: '/etc/apt/apt.conf.d/.~'

I saved the messages to a file and attached it.

I worked around the problem by moving /etc/apt/apt.conf.d/.~/ elsewhere.

** Affects: unity-control-center (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "unity-control-center-is-a-directory.txt"
   
https://bugs.launchpad.net/bugs/1608543/+attachment/4711603/+files/unity-control-center-is-a-directory.txt

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https://bugs.launchpad.net/bugs/1608543

Title:
  Network applet fails to apply proxy settings system wide, giving
  IsADirectoryError message

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