OK first i was mistaken, i though i installed it on a ext3 file system partition but it was on a ext4 partition
After i fresh install on a ext3 partition everything runs fine. So i guess the problem wasn't the notification application but the ext4 file system partition itself. For some reasons the modifications post- installation wasn't completely wrote on the hard drive in real time leading to a data loss and an unusual high memory and CPU usage. So the ext4 file system partition needs to be fixed. Meanwhile if anyone else is experiencing data loss, extensive memory and/or CPU usage or desktop hanging i'd suggest to do a fresh install on a ext3 file system partition instead of a ext4 and see if it solves the problems. It seems to be solved on my side because now my Kubuntu is installed on a ext3 partition and all the bugs i encountered previously on a ext4 partition installation are gone. So i guess this one could be filed as closed/solved NOTE : It seems the ext4 file system partition have some of its previous bugs back because as i recall when it was new and meant to replace the ext3 file system it had a data loss bug, changes not saved, system hang after reboot and some other bugs as well. I don't know if the extensive memory usage, cpu usage and the system symptoms i experienced before can be related to the ext4 file system though. However since reinstalling Kubuntu on a ext3 seems to have solved my problems. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1449848 Title: Kubuntu 15.04 Vivid odd behavior when notifications pop up To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1449848/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs