Public bug reported: The ppa package does conflict with regular package installed (redshift & redshift-gtk). The conflict happens when redshift and redshift-gtk are installed before the ppa package is installed. The package redshift-gtk provides '/usr/bin/gtk-redshift' and then conflicts with redshift from ppa as they both try to install this file.
I suggest using "Conflicts: redshift-gtk" and "Replaces: redshift-gtk" to avoid problem. $ lsb_release -rd Description: Ubuntu 11.04 Release: 11.04 $ apt-cache policy redshift redshift: Installed: 1.7-0ubuntu1 Candidate: 1.7-0ubuntu1 Version table: *** 1.7-0ubuntu1 0 500 http://ppa.launchpad.net/jonls/redshift-ppa/ubuntu/ natty/main amd64 Packages 100 /var/lib/dpkg/status 1.6-1ubuntu1 0 500 http://archive.ubuntu.com/ubuntu/ natty/universe amd64 Packages ProblemType: Package DistroRelease: Ubuntu 11.04 Package: gtk-redshift (not installed) ProcVersionSignature: Ubuntu 2.6.38-13.52-generic 2.6.38.8 Uname: Linux 2.6.38-13-generic x86_64 AptOrdering: redshift: Install gtk-redshift: Install redshift: Configure gtk-redshift: Configure Architecture: amd64 Date: Wed Dec 14 12:45:00 2011 DpkgTerminalLog: Unpacking redshift (from .../redshift_1.7-0ubuntu1_amd64.deb) ... Selecting previously deselected package gtk-redshift. Unpacking gtk-redshift (from .../gtk-redshift_1.6-1ubuntu1_all.deb) ... dpkg: error processing /var/cache/apt/archives/gtk-redshift_1.6-1ubuntu1_all.deb (--unpack): trying to overwrite '/usr/bin/gtk-redshift', which is also in package redshift 1.7-0ubuntu1 ErrorMessage: trying to overwrite '/usr/bin/gtk-redshift', which is also in package redshift 1.7-0ubuntu1 InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110426) SourcePackage: redshift Title: package gtk-redshift (not installed) failed to install/upgrade: trying to overwrite '/usr/bin/gtk-redshift', which is also in package redshift 1.7-0ubuntu1 UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: redshift (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-package natty -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/906144 Title: package gtk-redshift not installed failed to install/upgrade: trying to overwrite /usr/bin/gtk-redshift , which is also in package redshift 1.7-0ubuntu1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/redshift/+bug/906144/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs