Cannot open device

[hiroppy]

miku@hiroppy-AO751h:~$ sudo kamerka
[sudo] password for miku:
Kamerka version 0.8.1
    Copyright (C) 2011 Sebastian Krzyszkowiak
    Kamerka comes with ABSOLUTELY NO WARRANTY.
    This is free software, and you are welcome to redistribute it
    under certain conditions; type `./kamerka --license' for details.
Error: "/var/tmp/kdecache-miku" is owned by uid 1001 instead of uid 0.
Error: "/tmp/kde-miku" is owned by uid 1001 instead of uid 0.
Error: "/tmp/ksocket-miku" is owned by uid 1001 instead of uid 0.
Error: "/tmp/kde-miku" is owned by uid 1001 instead of uid 0.
kdeinit4: Shutting down running client.
Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
Error: "/tmp/ksocket-miku" is owned by uid 1001 instead of uid 0.
Error: "/tmp/kde-miku" is owned by uid 1001 instead of uid 0.
QDBusConnection: session D-Bus connection created before QCoreApplication. Application may misbehave.
QDBusConnection: session D-Bus connection created before QCoreApplication. Application may misbehave.
Error: "/var/tmp/kdecache-miku" is owned by uid 1001 instead of uid 0.
kbuildsycoca4 running...
Error: "/var/tmp/kdecache-miku" is owned by uid 1001 instead of uid 0.
kbuildsycoca4(9692) KBuildSycoca::checkTimestamps: checking file timestamps
kbuildsycoca4(9692) KBuildSycoca::checkTimestamps: timestamps check ok
kbuildsycoca4(9692) kdemain: Emitting notifyDatabaseChanged ()
Error: "/var/tmp/kdecache-miku" is owned by uid 1001 instead of uid 0.
kamerka(9662)/kdecore (KConfigSkeleton) KCoreConfigSkeleton::writeConfig:
kamerka(9662): Cannot open device
kamerka(9662)/kdecore (KConfigSkeleton) KCoreConfigSkeleton::writeConfig:
kamerka(9662): Cannot open device
kamerka(9662)/kdecore (KConfigSkeleton) KCoreConfigSkeleton::writeConfig:
kamerka(9662): Cannot open device
kamerka(9662)/kdecore (KConfigSkeleton) KCoreConfigSkeleton::writeConfig:
kamerka(9662): Cannot open device
miku@hiroppy-AO751h:~$ sudo kamerka
Kamerka version 0.8.1
    Copyright (C) 2011 Sebastian Krzyszkowiak
    Kamerka comes with ABSOLUTELY NO WARRANTY.
    This is free software, and you are welcome to redistribute it
    under certain conditions; type `./kamerka --license' for details.
Error: "/var/tmp/kdecache-miku" is owned by uid 1001 instead of uid 0.
kamerka(9703)/kdecore (KConfigSkeleton) KCoreConfigSkeleton::writeConfig:
kamerka(9703): Cannot open device

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: kamerka 0.8.1-1
ProcVersionSignature: Ubuntu 3.2.0-36.57-generic-pae 3.2.35
Uname: Linux 3.2.0-36-generic-pae i686
ApportVersion: 2.0.1-0ubuntu17.1
Architecture: i386
Date: Thu Jan 31 19:00:06 2013
InstallationMedia: Ubuntu 12.04 "Precise" - Build i386 LIVE Binary 20120501-03:27
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=ja_JP.UTF-8
 SHELL=/bin/bash
SourcePackage: kamerka
UpgradeStatus: No upgrade log present (probably fresh install)

[dos (seba-dos1)]

Are you sure you have V4L device available and working? Kamerka uses by default /dev/video0 device. If that doesn't match your system one, then just replace it in configuration dialog.

If kernel does not see your webcam, then Kamerka won't see it too.