Sérgio Basto wrote:
I remove some file from ~/.config/akonadi/  and myql.err show up
errors and that suggest to use mysql_upgrade .
I have done as root :
"as root" was your error there. This must be run as your regular user (i.e.,
sergio). Otherwise, you end up with your database files being owned by root
and no longer usable by the regular user account.