Hi, yesterday I decided to upgrade to Fedora 21, soon to be in Alpha. It all works smoothly and my only problem was with akonadi and thus with kmail. Where I got [ERROR] mysqld got signal 11 ; The full error log is available as attachment. Since despair is not an option I searched for help and I got to this page about Arch and the same problem: https://bbs.archlinux.org/viewtopic.php?id=184192 After reading I decided to remove the ~/.local/share/akonadi/mysql.conf log out and log in and voilá I am again an happy camper. :-) FWIW, as reported in the link above, there is not any difference between the file that I had removed (moved actually, not that it matters) and the new file placed there. I suspected that the absence of that file triggers the right procedure. I hope this helps others. Regards, -- José Abílio