After invoking `yagf` (which crashes reliably when loading multiple images), a dialog pops up with a note that there's no sufficient storage to file a bug. The output of `df -h` shows that this is not the case:
Dateisystem Größe Benutzt Verf. Verw% Eingehängt auf
udev 7,8G 0 7,8G 0% /dev
tmpfs 1,6G 9,5M 1,6G 1% /run
/dev/sda5 98G 87G 7,9G 92% /
tmpfs 7,8G 872K 7,8G 1% /dev/shm
tmpfs 5,0M 4,0K 5,0M 1% /run/lock
tmpfs 7,8G 0 7,8G 0% /sys/fs/cgroup
/dev/sda5 98G 87G 7,9G 92% /home
/dev/sda10 964M 280M 618M 32% /boot
/dev/sda1 300M 7,0M 293M 3% /boot/efi
/dev/sda4 821G 807G 12G 99% /mnt/DATA
cgmfs 100K 0 100K 0% /run/cgmanager/fs
tmpfs 1,6G 80K 1,6G 1% /run/user/1000
/home/richter/.Private 98G 87G 7,9G 92% /home/richter
/dev/sdc2 1,2G 137M 956M 13% /media/richter/096915e7-4dc9-4d3a-befe-a6f1a69b02fb
/dev/sdc3 30G 8,4G 20G 31% /media/richter/7beee67f-6425-4704-9f96-ceeb9ea32082
/dev/sdc6 157G 142G 16G 90% /media/richter/MEIN ORDNER
/dev/sdb1 4,6T 3,9T 730G 85% /media/richter/bd6298ea-0748-45fe-87c8-eace6793ca89
encfs 821G 807G 12G 99% /mnt/DATA/richter/Dateien/Device10
ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: apport 2.17-0ubuntu1
Uname: Linux 4.0.0-040000rc7-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.17-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Apr 8 02:48:48 2015
EcryptfsInUse: Yes
InstallationDate: Installed on 2015-04-02 (5 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Beta amd64 (20150326)
PackageArchitecture: all
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=de_DE.UTF-8
SHELL=/bin/bash
SourcePackage: apport
UpgradeStatus: No upgrade log present (probably fresh install)
This release of Ubuntu is no longer receiving maintenance updates. If this is still an issue on a maintained version of Ubuntu please let us know.