Package: ifupdown
Version: 0.8.16
Severity: normal

Dear Maintainer,

I edited /etc/networking/interfaces.d/wlan0 on my system using jo
to change the configuration. When saving, many editors, including
joe, leave backups that end with a tilde '~'. When I run
$ ifup wlan0
or when the system tries to bring up the interface at boot, the
system loads the backup created by the editor in addition to the
current version, and as a result, gets confused. (I believe it tries
to set the route twice.)

This, of course, results in the network not working, and the reason is
not obvious, leading to wasted time trying to fix it.

-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 4.7.0-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages ifupdown depends on:
ii  adduser              3.115
ii  init-system-helpers  1.45
ii  iproute2             4.6.0-4
ii  libc6                2.24-3
ii  lsb-base             9.20160629

Versions of packages ifupdown recommends:
ii  isc-dhcp-client [dhcp-client]  4.3.5~b1-1

Versions of packages ifupdown suggests:
pn  ppp     <none>
pn  rdnssd  <none>

-- no debconf information

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