edit-patch does not recognize installed patch systems

[BeowulfOF]

beowulf@PowerWolf:~/Projekte/ubuntu-bzr/deja-dup-bug-1380996$ lsb_release -rd
Description: Ubuntu 15.04
Release: 15.04
beowulf@PowerWolf:~/Projekte/ubuntu-bzr/deja-dup-bug-1380996$ apt-cache policy ubuntu-dev-tools
ubuntu-dev-tools:
  Installiert: 0.155~ubuntu2
  Installationskandidat: 0.155~ubuntu2
  Versionstabelle:
 *** 0.155~ubuntu2 0
        500 http://de.archive.ubuntu.com/ubuntu/ vivid/universe amd64 Packages
        100 /var/lib/dpkg/status

Using the edit-patch command in a fresh bzr repository leads to the following errormessage:

beowulf@PowerWolf:~/Projekte/ubuntu-bzr/deja-dup-bug-1380996$ edit-patch 10-volsize
No patchsystem detected, cannot create new patch (no dpatch/quilt/cdbs?)

according to apt-cache at least quilt is installed:
beowulf@PowerWolf:~/Projekte/ubuntu-bzr/deja-dup-bug-1380996$ apt-cache policy quilt
quilt:
  Installiert: 0.63-3
  Installationskandidat: 0.63-3
  Versionstabelle:
 *** 0.63-3 0
        500 http://de.archive.ubuntu.com/ubuntu/ vivid/main amd64 Packages
        100 /var/lib/dpkg/status

Commands taken to reproduce:
bzr branch lp:deja-dup deja-dup-1380996
cd deja-dup-1380996
edit-patch 10-volsize

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: ubuntu-dev-tools 0.155~ubuntu2
ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
Uname: Linux 3.19.0-15-generic x86_64
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
CurrentDesktop: GNOME
Date: Wed May 6 13:15:46 2015
EcryptfsInUse: Yes
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-dev-tools
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Dan Streetman (ddstreet)]

please reopen if this problem still exists