File in /etc/skel/ ending in Space causes adduser to fail

[Dean]

Repro is quite simple, place a file in `/etc/skel/` who's filename ends with the space character.
When running `adduser`, an error `No such file or directory` will be thrown.

Instructions:

 $ sudo touch "/etc/skel/file-with-space "
 $ sudo adduser test

What I expected to happen:

- User to be created

What happened instead:

- Error thrown, user not created.

Example:

 $ sudo touch "/etc/skel/file-with-space "
 $ sudo adduser test
 Adding user `test' ...
 Adding new group `test' (1001) ...
 Adding new user `test' (1001) with group `test' ...
 Creating home directory `/home/test' ...
 Copying files from `/etc/skel' ...
 Stopped: open /etc/skel/./file-with-space : No such file or directory
 Removing directory `/home/test' ...
 Removing user `test' ...
 Removing group `test' ...
 groupdel: group 'test' does not exist
 adduser: `groupdel test' returned error code 6. Exiting.

 $ lsb_release -rd
 Description: Ubuntu 14.04.2 LTS
 Release: 14.04

 $ apt-cache policy adduser
 adduser:
   Installed: 3.113+nmu3ubuntu3
   Candidate: 3.113+nmu3ubuntu3
   Version table:
  *** 3.113+nmu3ubuntu3 0
         500 http://au.archive.ubuntu.com/ubuntu/ utopic/main amd64 Packages
         100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: adduser 3.113+nmu3ubuntu3
ProcVersionSignature: Ubuntu 3.13.0-46.77-generic 3.13.11-ckt15
Uname: Linux 3.13.0-46-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.7
Architecture: amd64
CurrentDesktop: Unity
Date: Thu May 28 09:22:23 2015
InstallationDate: Installed on 2013-11-06 (567 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
PackageArchitecture: all
SourcePackage: adduser
UpgradeStatus: Upgraded to trusty on 2015-03-08 (80 days ago)