I've removed the beryl upstream repository from my sources.list and now it seems that there are some missing dependencies in the beryl package from universe:
$ sudo apt-get install beryl Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. Since you only requested a single operation it is extremely likely that the package is simply not installable and a bug report against that package should be filed. The following information may help to resolve the situation: The following packages have unmet dependencies: beryl: Depends: beryl-plugins but it is not installable Depends: beryl-settings but it is not going to be installed E: Broken packages ** Attachment added: "/etc/apt/sources.list" http://librarian.launchpad.net/6931511/sources.list -- Package "emerald" not available https://launchpad.net/bugs/95565 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs