I fixed this problem with: echo 16384 > /proc/sys/fs/inotify/max_user_watches
To make it permanent, create /etc/sysctl.d/60-user.conf with the content below: fs.inotify.max_user_watches=16384 Before applying the fix, I got the errors below: k...@dragon:~$ kpackagekit & [2] 3561 k...@dragon:~$ QInotifyFileSystemWatcherEngine::addPaths: inotify_add_watch failed: No space left on device QFileSystemWatcher: failed to add paths: /home/kent/.config/ibus/bus/fc60bfcf9319c7743716b7214863c295-unix-0 enumFromString ( Group ) : converted "unknown" to "UnknownGroup" , enum value 34 removing transaction from pool : "/108_eccdeaed_data" removing transaction from pool : "/109_ceadbdca_data" removing transaction from pool : "/110_bcdbadea_data" enumFromString ( State ) : converted "" to "UnknownState" , enum value 18 Attempting to obtain authorization for org.freedesktop.packagekit.system-update. Authentication as an administrative user is required. The following users qualify as administrative users: kent Select user: Failed to obtain authorization for org.freedesktop.packagekit.system-update. Authentification error : org.freedesktop.DBus.Error.NoReply : Message did not receive a reply (timeout by message bus) removing transaction from pool : "/111_eebdaaba_data" -- Policy-kit kde crash on install package https://bugs.launchpad.net/bugs/373542 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs