Follow instructiosns here.
Please post the log created by this command:
LC_ALL=C sudo dnf up 2>&1| tee dnf-up-log.txt
Note (all users): When you post problems in OpenMandriva forum post all the information . You do not know what a developer might find relevant regarding your issue. If you post about problems with this upgrade/distro-sync include either the dsync-log.txt or the dnf-up-log.txt depending on which command you used.