Dfc display error with LVM

[Daniel Mehrmann]

It shows "+dev/mapper/system-backup" instead of "/dev/..." I'm using LVM setup:

Trigger für man-db (2.6.7.1-1ubuntu1) werden verarbeitet ...
dfc (2.5.0-1) wird eingerichtet ...
daniel@Homer:/var/log$ dfc
FILESYSTEM (=) USED FREE (-) %USED AVAILABLE TOTAL MOUNTED ON
/dev/mapper/system-root [=====---------------] 23% 3.0G 3.8G /
none [--------------------] 0% 4.0K 4.0K /sys/fs/cgroup
udev [=-------------------] 0% 3.9G 3.9G /dev
tmpfs [=-------------------] 0% 797.0M 798.5M /run
none [--------------------] 0% 5.0M 5.0M /run/lock
none [=-------------------] 0% 3.9G 3.9G /run/shm
none [=-------------------] 0% 100.0M 100.0M /run/user
/dev/sdb1 [=====---------------] 24% 371.5M 487.9M /boot
/dev/mapper/system-usr [===========---------] 52% 7.5G 15.6G /usr
+ev/mapper/system-backup [==============------] 66% 128.8G 377.8G /backup
/dev/mapper/system-var [===-----------------] 14% 13.4G 15.6G /var
/dev/mapper/system-tmp [==------------------] 6% 3.6G 3.8G /tmp
/dev/mapper/system-opt [=====---------------] 22% 3.0G 3.8G /opt
/dev/mapper/system-home [=================---] 83% 42.8G 251.9G /home
/dev/mapper/system-vm [==================--] 87% 34.3G 255.9G /var/local/vm
daniel@Homer:/var/log$ which dfc
/usr/bin/dfc
daniel@Homer:/var/log$ file /usr/bin/dfc
/usr/bin/dfc: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.24, BuildID[sha1]=caee3df73cd0e02cf3c3166a822f9b362dc893ef, stripped
daniel@Homer:/var/log$ which dfc
/usr/bin/dfc
daniel@Homer:/var/log$ dfc
FILESYSTEM (=) USED FREE (-) %USED AVAILABLE TOTAL MOUNTED ON
/dev/mapper/system-root [=====---------------] 23% 3.0G 3.8G /
none [--------------------] 0% 4.0K 4.0K /sys/fs/cgroup
udev [=-------------------] 0% 3.9G 3.9G /dev
tmpfs [=-------------------] 0% 797.0M 798.5M /run
none [--------------------] 0% 5.0M 5.0M /run/lock
none [=-------------------] 0% 3.9G 3.9G /run/shm
none [=-------------------] 0% 100.0M 100.0M /run/user
/dev/sdb1 [=====---------------] 24% 371.5M 487.9M /boot
/dev/mapper/system-usr [===========---------] 52% 7.5G 15.6G /usr
+ev/mapper/system-backup [==============------] 66% 128.8G 377.8G /backup
/dev/mapper/system-var [===-----------------] 14% 13.4G 15.6G /var
/dev/mapper/system-tmp [==------------------] 6% 3.6G 3.8G /tmp
/dev/mapper/system-opt [=====---------------] 22% 3.0G 3.8G /opt
/dev/mapper/system-home [=================---] 83% 42.8G 251.9G /home
/dev/mapper/system-vm [==================--] 87% 34.3G 255.9G /var/local/vm
daniel@Homer:/var/log$

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: dfc 2.5.0-1
ProcVersionSignature: Ubuntu 3.13.0-48.80-generic 3.13.11-ckt16
Uname: Linux 3.13.0-48-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.8
Architecture: amd64
CurrentDesktop: XFCE
Date: Mon Apr 6 09:17:49 2015
Dependencies:
 gcc-4.9-base 4.9.1-0ubuntu1
 libc6 2.19-0ubuntu6.6
 libgcc1 1:4.9.1-0ubuntu1
 multiarch-support 2.19-0ubuntu6.6
InstallationDate: Installed on 2014-12-08 (118 days ago)
InstallationMedia: Xubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140723)
SourcePackage: dfc
UpgradeStatus: No upgrade log present (probably fresh install)