Troubleshooting:Mythbackend will not start after upgrade 0.26 Time Zone error
From MythTV Official Wiki
"MySQL Time Zone support is required. Please install it and try again" error after upgrading to 0.26
Type the following (as root) to fix this problem:
mysql_tzinfo_to_sql /usr/share/zoneinfo | mysql -uroot mysql
Add -p if password is in place on your MySQL database:
mysql_tzinfo_to_sql /usr/share/zoneinfo | mysql -uroot -p mysql